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<h2 id="b">B</h2>
<p>Return to <a href="as4glos.htm#as4glos">Glossary</a>.</p>
<dl>
<dt id="x2015001" class="bold">
<a name="x2015001"></a>backbone</dt>
<dd>A set of nodes and their
interconnecting links that form a central, high-speed network interconnecting
other, typically lower-speed, networks or client nodes.</dd>
<dt id="x2015009" class="bold">
<a name="x2015009"></a>background color</dt>
<dd>In the GDDM&reg; function, the
first color of the display medium; for example, black on a display or white
on a printer. See also <a href="rzaatn.htm#x2031478">neutral color</a>.</dd>
<dt id="x2015019" class="bold">
<a name="x2015019"></a>back out</dt>
<dd>To remove changes from a
physical file member in the inverse order from which the changes were originally
made.</dd>
<dt id="x2049772" class="bold">
<a name="x2049772"></a>backout</dt>
<dd>An operation that reverses
all the changes made during the current unit of recovery or unit of work.
After the operation is complete, a new unit of recovery or unit of work begins.
See also <a href="rzaatc.htm#x2000758">commit</a>.</dd>
<dt id="x2015028" class="bold">
<a name="x2015028"></a>backout recovery</dt>
<dd>The process of returning
a file to a particular point by removing journaled changes to the file.</dd>
<dt id="x2139372" class="bold">
<a name="x2139372"></a>backplane</dt>
<dd>A hardware part that has
(in one or more planes) logic paths, low-voltage distribution paths, and grounding
paths of a section of a machine.</dd>
<dt id="x2015033" class="bold">
<a name="x2015033"></a>back up</dt>
<dd>To save information or objects
on a system, usually to tape or diskette, for safekeeping.</dd>
<dt id="x2015038" class="bold">
<a name="x2015038"></a>backup</dt>
<dd>(1) Pertaining to an alternative
copy used as a substitute if the original is lost or destroyed, such as a
backup log.</dd>
<dd>(2) A tape, diskette, or save file containing saved objects.</dd>
<dd>(3) The process of copying a file, directory, file system, or other
data onto a tape, disk, or other media as insurance against data loss or corruption.
When a user backs up a directory or filesystem, the backup procedure preserves
the directory structure. See also <a href="rzaatr.htm#x2004302">restore</a>.</dd>
<dt id="x2015057" class="bold">
<a name="x2015057"></a>backup control group</dt>
<dd>In Backup Recovery
and Media Services, a group of libraries, system keywords, and lists that
share common backup characteristics. The default values for a backup control
group are defined in the backup policy and can be used or overridden by each
backup control group.</dd>
<dt id="x2049782" class="bold">
<a name="x2049782"></a>backup focal point</dt>
<dd>A focal point
that provides management services support for a particular category for a
node in the event of a communications failure with the primary focal point.
Both assigned focal points (explicit and implicit) and default focal points
can have backup counterparts. See also <a href="rzaatp.htm#x2034455">primary focal
point</a>.</dd>
<dt id="x2015062" class="bold">
<a name="x2015062"></a>backup history</dt>
<dd>In Backup Recovery
and Media Services, a report of what has been backed up with a BRMS backup
policy. A backup history contains information about each item such as what
type of object it is, the date and time it was saved, and when the saved item
expires. Synonymous with media information report.</dd>
<dt id="x2015067" class="bold">
<a name="x2015067"></a>backup list</dt>
<dd>(1) In the Operational Assistant
function, a list of libraries or folders to be saved on a regular basis, such
as daily or weekly.</dd>
<dd>(2) In Backup Recovery and Media Services, a group
of objects or folders that are grouped together for processing in a backup
control group. Each list is assigned a unique list name.</dd>
<dt id="x2015075" class="bold">
<a name="x2015075"></a>backup node</dt>
<dd>A cluster node on which
there is a secondary copy of a cluster resource. The copy is kept current
through replication.</dd>
<dt id="x2015080" class="bold">
<a name="x2015080"></a>backup policy</dt>
<dd>In Backup Recovery
and Media Services, a set of controls that are used to track information about
the items that are being backed up, when they are being backed up, and where
they are being backed up. Backup policy is a combination of the concepts of
control group and media policy.</dd>
<dt id="x2015085" class="bold">
<a name="x2015085"></a>Backup Recovery and Media Services (BRMS)</dt>
<dd>An IBM&reg; licensed program that provides user-modifiable backup, archive, recovery,
and media management functions and policies.</dd>
<dt id="x2015090" class="bold">
<a name="x2015090"></a>backup system</dt>
<dd>In iSeries&trade; Navigator,
a server that replaces a central system when the central system requires maintenance
or upgrades.</dd>
<dt id="x2015095" class="bold">
<a name="x2015095"></a>bandwidth</dt>
<dd>The capacity of a communications
line, normally expressed in bits per second (bps).</dd>
<dt id="x2015100" class="bold">
<a name="x2015100"></a>bar chart</dt>
<dd>A chart consisting of several
bars of equal width. The value of the dependent variable is indicated by the
height of each bar.</dd>
<dt id="x2015105" class="bold">
<a name="x2015105"></a>bar code</dt>
<dd>A pattern of bars of various
widths containing data to be interpreted by a scanning device.</dd>
<dt id="x2015110" class="bold">
<a name="x2015110"></a>bar graph</dt>
<dd>In Performance Tools, a
graph consisting of several bars of equal width. The value of the dependent
variable is indicated by the height of each bar.</dd>
<dt id="x2015115" class="bold">
<a name="x2015115"></a>base</dt>
<dd>The numbering system in which
an arithmetic value is represented.</dd>
<dt id="x2000303" class="bold">
<a name="x2000303"></a>base aggregate table</dt>
<dd>In SQL replication,
a type of replication target table that contains data that is aggregated from
a replication source table.</dd>
<dt id="x2015123" class="bold">
<a name="x2015123"></a>baseband</dt>
<dd>A frequency band that uses
the complete bandwidth of a transmission and requires all stations in the
network to participate in every transmission.</dd>
<dt id="x2046415" class="bold">
<a name="x2046415"></a>base class</dt>
<dd>See <a href="rzaatp.htm#x2033166">parent class</a>.</dd>
<dt id="x2015128" class="bold">
<a name="x2015128"></a>base number</dt>
<dd>The part of a self-check
field from which the check digit is calculated.</dd>
<dt id="x2015133" class="bold">
<a name="x2015133"></a>base pool</dt>
<dd>A storage area that contains
all unassigned main storage on the system and whose minimum size is specified
in the system value QBASPOOL. The system-recognized identifier is *BASE.</dd>
<dt id="x2015138" class="bold">
<a name="x2015138"></a>base project</dt>
<dd>In VisualAge&reg; RPG, a
collection of files that make up a VRPG component.</dd>
<dt id="x2015148" class="bold">
<a name="x2015148"></a>BASIC (beginner's all-purpose symbolic instruction
code)</dt>
<dd>A high-level programming language with a small number of
statements and a simple syntax. BASIC is designed to be easily learned and
used and is widely used for interactive applications on microcomputers.</dd>
<dt id="x2015143" class="bold">
<a name="x2015143"></a>basic assistance level</dt>
<dd>The type of
displays that provides the most assistance. Basic assistance level supports
the more common user and operator tasks, and does not use computer terminology.</dd>
<dt id="x2210594" class="bold">
<a name="x2210594"></a>basic assurance test (BAT)</dt>
<dd>An automatic
testing of a machine when the power is switched on.</dd>
<dt id="x2015153" class="bold">
<a name="x2015153"></a>basic character</dt>
<dd>Frequently used double-byte
character that is stored in the hardware of a DBCS-capable work station. The
number of double-byte characters that are stored in the work station varies
with the language supported and the storage size of the work station. A DBCS-capable
work station can display or print basic characters without using the extended
character processing function of the operating system. See also <a href="rzaate.htm#x2027444">extended character processing</a>, <a href="rzaate.htm#x2054724">extended character</a>.</dd>
<dt id="x2000321" class="bold">
<a name="x2000321"></a>basic conversation</dt>
<dd>In APPC, a conversation
between two programs in which the sending program must construct generalized
data stream (GDS) records for the receiving program.</dd>
<dt id="x2015161" class="bold">
<a name="x2015161"></a>basic data exchange</dt>
<dd>A file format
for exchanging data on diskettes or tape between systems or devices.</dd>
<dt id="x2015166" class="bold">
<a name="x2015166"></a>basic disk pool</dt>
<dd>One or more storage
units that are defined from the disk units or disk-unit subsystems that make
up addressable disk storage. Disk pools (which are also known as auxiliary
storage pools ) provide a means of placing certain objects on specific disk
units to limit the impact of disk-media failures and to reduce recovery time.
A basic disk pool contains both objects and the libraries or directories that
contain the objects. Attributes such as authorization, ownership, and spooled
file attributes are stored in the system disk pool (also known as the system
ASP).</dd>
<dt id="x2015171" class="bold">
<a name="x2015171"></a>basic DST capability</dt>
<dd>A dedicated
service tools (DST) capability used by a service representative or an experienced
system user that provides access to DST functions that do not access sensitive
data.</dd>
<dt id="x2015176" class="bold">
<a name="x2015176"></a>Basic Encoding Rules (BER)</dt>
<dd>A set
of rules used to encode ASN.1 values as strings of octets.</dd>
<dt id="x2015181" class="bold">
<a name="x2015181"></a>basic information unit (BIU)</dt>
<dd>In SNA,
the unit of data and control information passed between the transmission and
control layers. It consists of a request or response header followed by a
request or response unit.</dd>
<dt id="x2072359" class="bold">
<a name="x2072359"></a>Basic Input/Output System (BIOS)</dt>
<dd>The code that controls basic hardware operations, such as interactions with
diskette drives, hard disk drives, and the keyboard.</dd>
<dt id="x2015191" class="bold">
<a name="x2015191"></a>basic link unit (BLU)</dt>
<dd>In SNA, the
unit of data and control information transmitted over a communications line
by data link control.</dd>
<dt id="x2015196" class="bold">
<a name="x2015196"></a>basic mapping support (BMS)</dt>
<dd>An interface
between CICS&reg; and application programs that formats input and output display data
and routes multiple-page output messages without regard for control characters
used by various terminals.</dd>
<dt id="x2015204" class="bold">
<a name="x2015204"></a>basic rate interface</dt>
<dd>The means of
ISDN access normally used by private subscribers, providing two B-channels
of 64kbits per second and one D-channel of 16kbits per second for signaling.
This is often known as 2B+D.</dd>
<dt id="x2139416" class="bold">
<a name="x2139416"></a>Basic Telecommunications Access Method (BTAM)</dt>
<dd>An access method that permits read and write communication with
remote devices.</dd>
<dt id="x2210596" class="bold">
<a name="x2210596"></a>BAT</dt>
<dd>See <a href="rzaatb.htm#x2210594">basic
assurance test</a>.</dd>
<dt id="x2015214" class="bold">
<a name="x2015214"></a>batch</dt>
<dd>Pertaining to a group of jobs
to be run on a computer sequentially with the same program with little or
no operator action. See also <a href="rzaati.htm#x2025647">interactive</a>, <a href="rzaati.htm#x2025647">interactive</a>.</dd>
<dt id="x2015219" class="bold">
<a name="x2015219"></a>batch accumulator</dt>
<dd>In DFU, an accumulator
in which subtotals for a field are stored. See also <a href="rzaatt.htm#x2041731">total accumulator</a>.</dd>
<dt id="x2015224" class="bold">
<a name="x2015224"></a>batch device</dt>
<dd>Any device that can
read serial input or write serial output, or both, but cannot be used to communicate
interactively with the system. Examples of batch devices are printers, magnetic
tape units, or diskette units.</dd>
<dt id="x2015229" class="bold">
<a name="x2015229"></a>batch file</dt>
<dd>A file containing data
that is to be processed unattended.</dd>
<dt id="x2015234" class="bold">
<a name="x2015234"></a>batch job</dt>
<dd>A predefined group of processing
actions submitted to the system to be performed with little or no interaction
between the user and the system. See also <a href="rzaati.htm#x2025657">interactive
job</a>.</dd>
<dt id="x2015239" class="bold">
<a name="x2015239"></a>batch mode</dt>
<dd>In query management, the
query mode associated with a query instance that does not allow users to interact
with the query commands while a procedure is running.</dd>
<dt id="x2015244" class="bold">
<a name="x2015244"></a>batch processing</dt>
<dd>A method of running
a program or a series of programs in which one or more records (a batch) are
processed with little or no action from the user or operator. See also <a href="rzaati.htm#x2025667">interactive processing</a>.</dd>
<dt id="x2015249" class="bold">
<a name="x2015249"></a>batch shell</dt>
<dd>In CICS, a shell started
to handle CICS interval control timer requests. The batch shell is transparent
to the user; each user's program runs under its own user shell.</dd>
<dt id="x2015254" class="bold">
<a name="x2015254"></a>batch subsystem</dt>
<dd>A part of main storage
where batch jobs are processed.</dd>
<dt id="x2210701" class="bold">
<a name="x2210701"></a>battery power unit</dt>
<dd>A source of electrical
power that can be used when the normal utility power fails.</dd>
<dt id="x2021930" class="bold">
<a name="x2021930"></a>BCB</dt>
<dd>See <a href="rzaatb.htm#x2015519">block
control byte</a>.</dd>
<dt id="x2021703" class="bold">
<a name="x2021703"></a>BCC</dt>
<dd>See <a href="rzaatb.htm#x2021707">block-check
character</a>.</dd>
<dt id="x2015268" class="bold">
<a name="x2015268"></a>B-channel</dt>
<dd>See <a href="rzaatb.htm#x2156694">bearer channel</a>.</dd>
<dt id="x2015273" class="bold">
<a name="x2015273"></a>beaconing</dt>
<dd>Pertaining to an adapter
in a token-ring network that repeatedly sends a frame (beacon message) when
it is not receiving a normal signal because of serious error, such as a line
break or power failure. The message frame repeats until the error is corrected
or bypassed. See also <a href="rzaatb.htm#x2015278">beacon message</a>.</dd>
<dt id="x2015278" class="bold">
<a name="x2015278"></a>beacon message</dt>
<dd>A message frame sent
repeatedly by an adapter indicating a serious network problem, such as a broken
cable. See also <a href="rzaatb.htm#x2015273">beaconing</a>.</dd>
<dt id="x2015283" class="bold">
<a name="x2015283"></a>bean</dt>
<dd>A definition or instance of
a JavaBeans&trade; component. See also <a href="rzaatj.htm#x2027650">JavaBeans</a>.</dd>
<dt id="x2156694" class="bold">
<a name="x2156694"></a>bearer channel (B-channel)</dt>
<dd>In ISDN,
a duplex channel for transmitting data or digital voice between the terminal
and the network. The B-channel operates at 64 kilobits per second. See also <a href="rzaatd.htm#x2156997">delta channel</a>.</dd>
<dt id="x2015288" class="bold">
<a name="x2015288"></a>BEC</dt>
<dd>See <a href="rzaatb.htm#x2015864">bus
extension card</a>.</dd>
<dt id="x2022107" class="bold">
<a name="x2022107"></a>BED card</dt>
<dd>See <a href="rzaatb.htm#x2015869">bus extension driver card</a>.</dd>
<dt id="x2000336" class="bold">
<a name="x2000336"></a>before-image</dt>
<dd>The contents of a record
in a physical file before the data is changed by a write, an update, or a
delete operation.</dd>
<dt id="x2186914" class="bold">
<a name="x2186914"></a>beginner's all-purpose symbolic instruction code</dt>
<dd>See <a href="rzaatb.htm#x2015148">BASIC</a>.</dd>
<dt id="x2015299" class="bold">
<a name="x2015299"></a>beginning attribute character</dt>
<dd>For
a display file, the character that precedes the first position in a field
and that defines how the data in the field is displayed.</dd>
<dt id="x2015304" class="bold">
<a name="x2015304"></a>beginning-of-tape marker (BOT marker)</dt>
<dd>A reflective material placed on a magnetic tape to indicate where the
recording area starts.</dd>
<dt id="x2015309" class="bold">
<a name="x2015309"></a>BER</dt>
<dd>See <a href="rzaatb.htm#x2015176">Basic
Encoding Rules</a>.</dd>
<dt id="x2022111" class="bold">
<a name="x2022111"></a>BER card</dt>
<dd>See <a href="rzaatb.htm#x2015874">bus extension receiver card</a>.</dd>
<dt id="x2015318" class="bold">
<a name="x2015318"></a>BEST/1 for iSeries</dt>
<dd>The capacity planner for
a system. The BEST/1 for iSeries capacity planner is a function of the IBM Performance
Tools licensed program.</dd>
<dt id="x2015313" class="bold">
<a name="x2015313"></a>best-effort service</dt>
<dd>In QoS, the type
of service that by default is assigned to all traffic unless a network policy
specifies otherwise. This traffic is not given special forwarding treatment.</dd>
<dt id="x2045233" class="bold">
<a name="x2045233"></a>best-fit conversion</dt>
<dd>See <a href="rzaatl.htm#x2028685">linguistic conversion</a>.</dd>
<dt id="x2015323" class="bold">
<a name="x2015323"></a>bezel</dt>
<dd>A rim or surrounding part to
keep another part stationary.</dd>
<dt id="x2015328" class="bold">
<a name="x2015328"></a>BGU</dt>
<dd>See <a href="rzaatb.htm#x2015887">Business
Graphics Utility</a>.</dd>
<dt id="x2015340" class="bold">
<a name="x2015340"></a>bidder</dt>
<dd>An SNA LU-LU half-session
that is defined as requesting and receiving permission from another LU-LU
half-session to begin a bracket at the start of a session. See also <a href="rzaatf.htm#x2023071">first speaker</a>.</dd>
<dt id="x2015345" class="bold">
<a name="x2015345"></a>bidirectional language</dt>
<dd>A language
such as Arabic and Hebrew whose general flow of text proceeds horizontally
from right to left, but numbers, English, and other left-to-right language
text are written from left to right.</dd>
<dt id="x2015350" class="bold">
<a name="x2015350"></a>big endian (MSB)</dt>
<dd>A format for storage
or transmission of binary data in which the most significant bit (or byte)
is placed first. See also <a href="rzaatl.htm#x2028820">little endian</a>.</dd>
<dt id="x2015355" class="bold">
<a name="x2015355"></a>bin</dt>
<dd>An enclosure on a printer that
contains source or destination media, including paper, foils, labels, card
stock, or microfilm.</dd>
<dt id="x2015360" class="bold">
<a name="x2015360"></a>binary</dt>
<dd>(1) Pertaining to a selection,
choice, or condition that has two possible values.</dd>
<dd>(2) In DB2&reg; UDB for iSeries, pertaining to a data type indicating that the data is a binary number
with a precision of 15 (halfword) or 31 (fullword) bits.</dd>
<dd>(3) Pertaining
to a system of numbers with a base of two . The binary digits are 0 and 1.</dd>
<dt id="x2071623" class="bold">
<a name="x2071623"></a>binary digit (bit)</dt>
<dd>The smallest unit
of computer information, which has two possible states that are represented
by the binary digits 0 or 1.</dd>
<dt id="x2015372" class="bold">
<a name="x2015372"></a>binary file</dt>
<dd>A file that contains
codes that are not part of the ASCII character set. Binary files can utilize
all 256 possible values for each byte in the file.</dd>
<dt id="x2015377" class="bold">
<a name="x2015377"></a>binary floating-point number</dt>
<dd>The
conceptual form of a numeric value that contains a significand and a signed
exponent. The number's numeric value is the signed product of the number's
significand and 2 raised to the power of the number's exponent.</dd>
<dt id="x2015382" class="bold">
<a name="x2015382"></a>binary format</dt>
<dd>Representation of a
decimal value in which each field must be 2 or 4 bytes long. The sign (+ or
-) is in the far left bit of the field, and the number value is in the remaining
bits of the field. Positive numbers have a 0 in the sign bit and are in true
form. Negative numbers have a 1 in the sign bit and are in twos complement
form.</dd>
<dt id="x2000346" class="bold">
<a name="x2000346"></a>binary integer</dt>
<dd>A basic data type
that can be further classified as small integer or large integer.</dd>
<dt id="x2015387" class="bold">
<a name="x2015387"></a>binary item</dt>
<dd>Numeric data that is
represented internally as a number in the base 2 numbering system; internally,
each bit of the item is a binary number with the sign as the far left bit.</dd>
<dt id="x2000351" class="bold">
<a name="x2000351"></a>binary large object</dt>
<dd>A block of bytes
of data (for example, the body of a message) that has no discernible meaning,
but is treated as one solid entity that cannot be interpreted.</dd>
<dt id="x2015395" class="bold">
<a name="x2015395"></a>binary operator</dt>
<dd>A symbol representing
an operation to be performed on two data items, arrays, or expressions. See
also <a href="rzaatu.htm#x2042417">unary operator</a>.</dd>
<dt id="x2015400" class="bold">
<a name="x2015400"></a>binary stream</dt>
<dd>In the C language,
a sequence of characters that corresponds on a one-to-one basis with the characters
in the file. No character translation is performed on binary streams.</dd>
<dt id="x2000356" class="bold">
<a name="x2000356"></a>binary string</dt>
<dd>In REXX, a literal
string expressed using a binary (base 2) representation of a value. The binary
representation is a sequence of zero or more binary digits (the characters
0 or 1) enclosed in quotation marks and followed by the character b.</dd>
<dt id="x2050074" class="bold">
<a name="x2050074"></a>binary synchronous communication (BSC)</dt>
<dd>A data communications line protocol that uses a standard set of transmission
control characters and control character sequences to send binary-coded data
over a communications line.</dd>
<dt id="x2021919" class="bold">
<a name="x2021919"></a>binary synchronous communications equivalence
link support (BSCEL support)</dt>
<dd>The intersystem communications function
(ICF) support on the iSeries system that provides binary synchronous communications
with other computers using BSC protocols.</dd>
<dt id="x2000361" class="bold">
<a name="x2000361"></a>bind</dt>
<dd>(1) To create a program, which can
be run, by combining one or more modules created by an Integrated Language Environment&reg; (ILE) compiler.</dd>
<dd>(2) To convert the output from the SQL compiler
or DMBS precompiler to a usable control structure, such as an access plan,
application plan, or package. During the bind process, access paths to the
data are selected and some authorization checking is performed.</dd>
<dt id="x2015430" class="bold">
<a name="x2015430"></a>BIND command</dt>
<dd>In SNA, a command used
to start a session between two logical units, and to define the characteristics
of that session. See also <a href="rzaatu.htm#x2042432">UNBIND command</a>.</dd>
<dt id="x2015435" class="bold">
<a name="x2015435"></a>binder</dt>
<dd>The system component that
creates a bound program by packaging Integrated Language Environment (ILE) modules and resolving symbols passed between those modules.</dd>
<dt id="x2015440" class="bold">
<a name="x2015440"></a>binder language</dt>
<dd>A small set of commands
(STRPGMEXP, EXPORT, and ENDPGMEXP) that defines the external interface (signature)
for a service program. These commands cannot be run alone and are of the source
type BND.</dd>
<dt id="x2015445" class="bold">
<a name="x2015445"></a>binding</dt>
<dd>The process of creating a
program by packaging Integrated Language Environment (ILE) modules and resolving
symbols passed between those modules.</dd>
<dt id="x2015453" class="bold">
<a name="x2015453"></a>binding directory</dt>
<dd>A list of names
of modules and service programs that may be needed when creating an ILE program
or service program. A binding directory is not a repository of the modules
and service programs. Instead, it allows them to be referred to by name and
type.</dd>
<dt id="x2015468" class="bold">
<a name="x2015468"></a>BIOS</dt>
<dd>See <a href="rzaatb.htm#x2072359">Basic
Input/Output System</a>.</dd>
<dt id="x2015472" class="bold">
<a name="x2015472"></a>bit</dt>
<dd>See <a href="rzaatb.htm#x2071623">binary
digit</a>.</dd>
<dt id="x2000379" class="bold">
<a name="x2000379"></a>bit data</dt>
<dd>Data with character type
CHAR or VARCHAR that is not associated with a coded character set and therefore
is never converted.</dd>
<dt id="x2123394" class="bold">
<a name="x2123394"></a>bitmap</dt>
<dd>A coded representation in
which each bit, or group of bits, represents or corresponds to an item; for
example, a configuration of bits in main storage in which each bit indicates
whether a peripheral device or a storage block is available or in which each
group of bits corresponds to one pixel of a display image.</dd>
<dt id="x2015477" class="bold">
<a name="x2015477"></a>bit mask</dt>
<dd>A pattern of bits designed
to be logically compared to an existing bit value. The mask pattern allows
only certain desired parts of the existing bit value to appear in the result
of the comparison.</dd>
<dt id="x2015659" class="bold">
<a name="x2015659"></a>bits per inch (bpi)</dt>
<dd>The density,
measured in number of bits per inch, at which information can be stored on
magnetic tape.</dd>
<dt id="x2052476" class="bold">
<a name="x2052476"></a>bits per second (bps)</dt>
<dd>In serial transmission,
the instantaneous bit speed with which a device or channel transmits a character.</dd>
<dt id="x2015482" class="bold">
<a name="x2015482"></a>bit string</dt>
<dd>A series of bits consisting
of the values 0 and 1.</dd>
<dt id="x2015487" class="bold">
<a name="x2015487"></a>BIU</dt>
<dd>See <a href="rzaatb.htm#x2015181">basic
information unit</a>.</dd>
<dt id="x2015491" class="bold">
<a name="x2015491"></a>blank after</dt>
<dd>In RPG, an output specification
option that changes the contents of a field so that it contains either zeros
(if it is a numeric field) or blanks (if it is a character field) after that
field is written to the output record.</dd>
<dt id="x2000384" class="bold">
<a name="x2000384"></a>block</dt>
<dd>A sequence of text, commands,
or records that are read, written, or processed as a unit.</dd>
<dt id="x2021707" class="bold">
<a name="x2021707"></a>block-check character (BCC)</dt>
<dd>The BSC
transmission control character that is used to determine if all of the bits
that were sent were also received.</dd>
<dt id="x2015519" class="bold">
<a name="x2015519"></a>block control byte (BCB)</dt>
<dd>In a multileaving
telecommunications access method, a control character used for transmission
block status and sequence count.</dd>
<dt id="x2015524" class="bold">
<a name="x2015524"></a>block copy</dt>
<dd>In SEU, to copy two or
more adjoining source records from one part of a source member to another
part, or from one source member to another.</dd>
<dt id="x2015529" class="bold">
<a name="x2015529"></a>block delete</dt>
<dd>In SEU, to delete two
or more adjoining source records from a source member.</dd>
<dt id="x2015534" class="bold">
<a name="x2015534"></a>block edit function</dt>
<dd>In AFP&trade; Utilities, a
function that moves, copies, or removes all elements defined in a specified
scope on the image area at one time.</dd>
<dt id="x2015539" class="bold">
<a name="x2015539"></a>blocked signal</dt>
<dd>In POSIX, a condition
that prevents a signal-handling action associated with a signal from being
performed. See also <a href="rzaatu.htm#x2042437">unblocked signal</a>.</dd>
<dt id="x2015544" class="bold">
<a name="x2015544"></a>block exclude</dt>
<dd>In SEU, to exclude
two or more adjoining records from the Edit or Browse display.</dd>
<dt id="x2015554" class="bold">
<a name="x2015554"></a>blocking factor</dt>
<dd>The number of records
in a block. A blocking factor is calculated by dividing the size of the block
by the size of the record.</dd>
<dt id="x2015559" class="bold">
<a name="x2015559"></a>block move</dt>
<dd>In SEU, to move two or
more adjoining source records from one part of a source member to another
part, or from one source member to another.</dd>
<dt id="x2015564" class="bold">
<a name="x2015564"></a>block overlay</dt>
<dd>In SEU, to overlay
two or more adjoining records with other records defined by the Copy or Move
line command.</dd>
<dt id="x2015569" class="bold">
<a name="x2015569"></a>block statement</dt>
<dd>In the C or C++ languages,
a group of data definitions, declarations, and statements appearing between
a left brace and a right brace that are processed as a unit. The block statement
is considered to be a single, C-language statement. In Ada language, a block
statement is a single statement that may contain a sequence of statements.
It may also include a declarative part, and exception handlers; their effects
are local to the block statement.</dd>
<dt id="x2015574" class="bold">
<a name="x2015574"></a>BLU</dt>
<dd>See <a href="rzaatb.htm#x2015191">basic
link unit</a>.</dd>
<dt id="x2015578" class="bold">
<a name="x2015578"></a>BMS</dt>
<dd>See <a href="rzaatb.htm#x2015196">basic
mapping support</a>.</dd>
<dt id="x2015592" class="bold">
<a name="x2015592"></a>Boolean data</dt>
<dd>In COBOL, a category
of data items that are limited to a value of 1 or 0.</dd>
<dt id="x2015597" class="bold">
<a name="x2015597"></a>Boolean literal</dt>
<dd>In COBOL, a literal
composed of a Boolean character enclosed in double quotation marks and preceded
by a B; for example, B "1" .</dd>
<dt id="x2015602" class="bold">
<a name="x2015602"></a>Boolean operator</dt>
<dd>In REXX, an operator
each of whose operands and whose result take one of two values (0 or 1).</dd>
<dt id="x2015607" class="bold">
<a name="x2015607"></a>BOOTP</dt>
<dd>See <a href="rzaatb.htm#x2015615">Bootstrap Protocol</a>.</dd>
<dt id="x2015615" class="bold">
<a name="x2015615"></a>Bootstrap Protocol (BOOTP)</dt>
<dd>A protocol
that allows a client to find both its Internet Protocol (IP) address and the
name of a file from a server on the network.</dd>
<dt id="x2071911" class="bold">
<a name="x2071911"></a>border</dt>
<dd>A public address that forms
a border between a trusted and an untrusted network. It describes the IP address
as an actual interface on the system. The system needs to know the "type"
of address you are defining. For example, your PCs IP address is trusted,
but your server's public IP address is border.</dd>
<dt id="x2015620" class="bold">
<a name="x2015620"></a>border system</dt>
<dd>A system that exists
within a trusted system but communicates between trusted and untrusted systems.
A border system prevents security from being compromised.</dd>
<dt id="x2015625" class="bold">
<a name="x2015625"></a>both field</dt>
<dd>A field that can be used
for either input data or output data.</dd>
<dt id="x2187205" class="bold">
<a name="x2187205"></a>BOT marker</dt>
<dd>See <a href="rzaatb.htm#x2015304">beginning-of-tape marker</a>.</dd>
<dt id="x2015634" class="bold">
<a name="x2015634"></a>bottleneck</dt>
<dd>A place in the system
where contention for a resource is affecting performance.</dd>
<dt id="x2015639" class="bold">
<a name="x2015639"></a>bottom margin</dt>
<dd>On a page, the space
between the body or the running footing, if any, and the bottom edge of the
page.</dd>
<dt id="x2015644" class="bold">
<a name="x2015644"></a>boundary violation</dt>
<dd>In COBOL, an attempt
to write beyond the externally defined boundaries of a sequential file.</dd>
<dt id="x2015649" class="bold">
<a name="x2015649"></a>bound program</dt>
<dd>An i5/OS&trade; object that
combines one or more modules created by an Integrated Language Environment (ILE) compiler.</dd>
<dt id="x2015654" class="bold">
<a name="x2015654"></a>box</dt>
<dd>A line enclosure that forms a
rectangle around text or a table.</dd>
<dt id="x2190018" class="bold">
<a name="x2190018"></a>bpi</dt>
<dd>See <a href="rzaatb.htm#x2015659">bits
per inch</a>.</dd>
<dt id="x2015664" class="bold">
<a name="x2015664"></a>bps</dt>
<dd>See <a href="rzaatb.htm#x2052476">bits
per second</a>.</dd>
<dt id="x2015669" class="bold">
<a name="x2015669"></a>bracket</dt>
<dd>In SNA, one or more chains
of request units and their responses, representing a complete transaction,
exchanged between two session partners.</dd>
<dt id="x2015674" class="bold">
<a name="x2015674"></a>bracketed DBCS</dt>
<dd>A character string
in which each character is represented by 2 bytes. The character string starts
with a shift-out (SO) character and ends with a shift-in (SI) character.</dd>
<dt id="x2015679" class="bold">
<a name="x2015679"></a>bracket protocol</dt>
<dd>In SNA, a data flow
control protocol in which exchanges between two session partners are achieved
through the use of brackets, with one partner designated at session activation
as the first speaker and the other as the bidder. The bracket protocol involves
bracket initiation and termination rules.</dd>
<dt id="x2015684" class="bold">
<a name="x2015684"></a>branch instruction</dt>
<dd>An instruction
that changes the sequence of instructions processed in a computer program.
The sequence of instructions continues at the address specified in the branch
instruction.</dd>
<dt id="x2015689" class="bold">
<a name="x2015689"></a>break delivery</dt>
<dd>The method of delivering
messages to a message queue in which the job associated with that message
queue is interrupted as soon as the message arrives.</dd>
<dt id="x2015694" class="bold">
<a name="x2015694"></a>break field</dt>
<dd>In AFP Utilities, a
field that causes a page break. When the Print Format Utility encounters a
record with a value that is not equal to that of the previous record, a page
break occurs.</dd>
<dt id="x2015699" class="bold">
<a name="x2015699"></a>breakpoint</dt>
<dd>A place in a program (specified
by a command or a condition) where the system stops the processing of that
program and gives control to the display station user or to a specified program.</dd>
<dt id="x2015707" class="bold">
<a name="x2015707"></a>breakpoint program</dt>
<dd>For a batch job,
a user program that can be called when a breakpoint is specified.</dd>
<dt id="x2015727" class="bold">
<a name="x2015727"></a>British thermal unit (Btu)</dt>
<dd>The amount
of heat required to raise a pound of water by 1 degree Fahrenheit.</dd>
<dt id="x2022101" class="bold">
<a name="x2022101"></a>British thermal unit per hour (Btu/hr)</dt>
<dd>An English unit of measure for heat produced in one hour.</dd>
<dt id="x2015732" class="bold">
<a name="x2015732"></a>BRMS</dt>
<dd>See <a href="rzaatb.htm#x2015085">Backup
Recovery and Media Services</a>.</dd>
<dt id="x2015736" class="bold">
<a name="x2015736"></a>broadband</dt>
<dd>A communication channel
that uses a wide frequency range divided into narrower bands that can be made
available to different users for the simultaneous transmission of different
signals (such as voice, video, and data). A broadband is capable of higher-speed
data transmission than a voice-grade channel.</dd>
<dt id="x2015741" class="bold">
<a name="x2015741"></a>broadcast</dt>
<dd>The simultaneous transmission
of the same data to all nodes connected to a network. See also <a href="rzaatm.htm#x2060518">multicast</a>.</dd>
<dt id="x2015754" class="bold">
<a name="x2015754"></a>broadcast message</dt>
<dd>A message sent
to all workstations.</dd>
<dt id="x2015764" class="bold">
<a name="x2015764"></a>browse</dt>
<dd>In message queuing, to use
the MQGET call to copy a message without removing it from the queue.</dd>
<dt id="x2015769" class="bold">
<a name="x2015769"></a>browse cursor</dt>
<dd>In message queuing,
an indicator used when browsing a queue to identify the message that is next
in sequence.</dd>
<dt id="x2409905" class="bold">
<a name="x2409905"></a>BSC</dt>
<dd>See <a href="rzaatb.htm#x2050074">binary
synchronous communication</a>.</dd>
<dt id="x2015787" class="bold">
<a name="x2015787"></a>BSC 3270 device emulation</dt>
<dd>A function
of the operating system that allows a server to appear to a BSC host system
as a 3274 Control Unit.</dd>
<dt id="x2015783" class="bold">
<a name="x2015783"></a>BSCEL support</dt>
<dd>See <a href="rzaatb.htm#x2021919">binary synchronous communications equivalence link support</a>.</dd>
<dt id="x2015792" class="bold">
<a name="x2015792"></a>BTAM</dt>
<dd>See <a href="rzaatb.htm#x2139416">Basic
Telecommunications Access Method</a>.</dd>
<dt id="x2015796" class="bold">
<a name="x2015796"></a>Btu</dt>
<dd>See <a href="rzaatb.htm#x2015727">British
thermal unit</a>.</dd>
<dt id="x2015800" class="bold">
<a name="x2015800"></a>Btu/hr</dt>
<dd>See <a href="rzaatb.htm#x2022101">British thermal unit per hour</a>.</dd>
<dt id="x2015805" class="bold">
<a name="x2015805"></a>buffer</dt>
<dd>An area of storage that compensates
for the different speeds of data flow or timings of events by temporarily
holding a block of data that is waiting to be processed or written to an I/O
device.</dd>
<dt id="x2015813" class="bold">
<a name="x2015813"></a>build</dt>
<dd>In the Application Development
Manager feature of the Application Development ToolSet licensed program, the
procedure that processes a part into a program.</dd>
<dt id="x2015818" class="bold">
<a name="x2015818"></a>build process</dt>
<dd>In the Application
Development Manager feature of the Application Development ToolSet licensed
program, the procedure that determines which parts of an application have
changed, and based on the relationship between those parts, compiles them
in the correct order.</dd>
<dt id="x2015823" class="bold">
<a name="x2015823"></a>build report</dt>
<dd>In the Application Development
Manager feature of the Application Development ToolSet licensed program, a
report that describes the results of the build process. This report can be
printed or viewed on a display.</dd>
<dt id="x2000414" class="bold">
<a name="x2000414"></a>built-in function</dt>
<dd>(1) In C and CL, a
predefined function, such as a commonly used arithmetic function or a function
necessary to high-level language compilers (for example, a function for manipulating
character strings or converting data). It is automatically called by a built-in
function reference.</dd>
<dd>(2) In REXX, a function that is supplied by a
language. These functions, defined as part of the REXX language, include character
manipulation, conversion, and information functions.</dd>
<dt id="x2015834" class="bold">
<a name="x2015834"></a>built-in function reference</dt>
<dd>In CL,
a built-in function name, having an optional, and possibly empty, argument
list that holds the value returned by the built-in function.</dd>
<dt id="x2015844" class="bold">
<a name="x2015844"></a>bundle</dt>
<dd>A group of journal entries
that are deposited together by the system.</dd>
<dt id="x2015849" class="bold">
<a name="x2015849"></a>burst</dt>
<dd>In AFP support, to separate continuous-forms paper
into separate sheets.</dd>
<dt id="x2015854" class="bold">
<a name="x2015854"></a>bus</dt>
<dd>One or more conductors used for
transmitting signals or power.</dd>
<dt id="x2015859" class="bold">
<a name="x2015859"></a>bus expansion</dt>
<dd>An expansion unit that
attaches to a system unit for the purpose of increasing the number of buses
on the system and which allows for additional I/O processor cards to be attached.</dd>
<dt id="x2015864" class="bold">
<a name="x2015864"></a>bus extension card (BEC)</dt>
<dd>The bus
extension driver card or the bus extension receiver card.</dd>
<dt id="x2015869" class="bold">
<a name="x2015869"></a>bus extension driver card (BED card)</dt>
<dd>The card, connected by a cable to a bus extension receiver (BER) card, that
is used to route data from one card enclosure to another card enclosure. The
direction of data can be from the processing unit to an input/output processor
in one of the card enclosures, or from an input/output processor in one of
the card enclosures to the processing unit. See also <a href="rzaatb.htm#x2015874">bus extension receiver card</a>.</dd>
<dt id="x2015874" class="bold">
<a name="x2015874"></a>bus extension receiver card (BER card)</dt>
<dd>The card, connected by a cable to a bus extension driver (BED) card,
that is used to route data from one card enclosure to another card enclosure.
The direction of data can be from the processing unit to an input/output processor
in one of the card enclosures, or from an input/output processor in one of
the card enclosures to the processing unit. See also <a href="rzaatb.htm#x2015869">bus extension driver card</a>.</dd>
<dt id="x2015887" class="bold">
<a name="x2015887"></a>Business Graphics Utility (BGU)</dt>
<dd>The IBM licensed program that can be used to design, plot, display, and print
business charts.</dd>
<dt id="x2015892" class="bold">
<a name="x2015892"></a>business intelligence</dt>
<dd>The consolidation
and analysis of data collected in the day-to-day operation of a business,
which is then used as a basis for better business decisions and competitive
advantage.</dd>
<dt id="x2015897" class="bold">
<a name="x2015897"></a>business management</dt>
<dd>In System Manager,
the discipline that encompasses inventory management, security management,
financial administration, business planning, and management services for all
enterprise-wide information systems.</dd>
<dt id="x2015902" class="bold">
<a name="x2015902"></a>bus-level partitioning</dt>
<dd>The dedicated
allocation of an entire bus and all accompanying resources (input/output processors
and input/output devices) to a particular logical partition. See also <a href="rzaati.htm#x2026167">IOP-level partitioning</a>.</dd>
<dt id="x2015907" class="bold">
<a name="x2015907"></a>button</dt>
<dd>A mechanism on a pointing
device, such as a mouse, used to request or start an action.</dd>
<dt id="x2015918" class="bold">
<a name="x2015918"></a>bypass plug</dt>
<dd>Allows power to flow
through an unused outlet in the power control compartment.</dd>
<dt id="x2015923" class="bold">
<a name="x2015923"></a>byte</dt>
<dd>A string that represents a character
and usually consists of eight binary digits that are treated as a unit. A
byte is the smallest unit of storage that can be addressed directly.</dd>
<dt id="x2015931" class="bold">
<a name="x2015931"></a>bytecode</dt>
<dd>Machine-independent code
generated by the Java&trade; compiler and executed by the Java interpreter.
(Sun)</dd></dl>
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