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<a name="v"></a>
<h2 id="v">V</h2>
<p>Return to <a href="as4glos.htm#as4glos">Glossary</a>.</p>
<dl>
<dt id="x2043376" class="bold">
<a name="x2043376"></a>V.24</dt>
<dd>In data communications, a specification
of the CCITT that defines the list of definitions for interchange circuits
between data terminal equipment (DTE) and data circuit-terminating equipment
(DCE).</dd>
<dt id="x2043381" class="bold">
<a name="x2043381"></a>V.25</dt>
<dd>In data communications, a specification
of the CCITT that defines the automatic answering equipment or parallel automatic
calling equipment or both on the General Switched Telephone Network, including
procedures for disabling of echo controlled devices for both manually and
automatically established calls.</dd>
<dt id="x2070216" class="bold">
<a name="x2070216"></a>V.25 bis</dt>
<dd>In data communications,
an interim specification of the CCITT that defines the connection of data
terminal equipment to a serial-dial interface of a public switched telephone
network.</dd>
<dt id="x2043391" class="bold">
<a name="x2043391"></a>V.35</dt>
<dd>In data communications, a specification
of the CCITT that defines the list of definitions for interchange circuits
between data terminal equipment (DTE) and data circuit-terminating equipment
(DCE) at data rates of 48 kilobits per second.</dd>
<dt id="x2042930" class="bold">
<a name="x2042930"></a>validation data</dt>
<dd>In Cryptographic
Support, information about a customer used to create and verify the customer's
personal identification number (PIN).</dd>
<dt id="x2042935" class="bold">
<a name="x2042935"></a>validity checking</dt>
<dd>(1) To verify the contents
of a field.</dd>
<dd>(2) To verify that object names used in DB2&reg; UDB for iSeries&trade; SQL statements exist on your system.</dd>
<dt id="x2005653" class="bold">
<a name="x2005653"></a>value</dt>
<dd>(1) In query management, a quantity
assigned to a keyword or variable associated with a query command.</dd>
<dd>(2) Data (numbers or character strings) entered in any entry field, or supplied
in parameters of commands.</dd>
<dd>(3) The smallest unit of data manipulated
in SQL.</dd>
<dt id="x2042955" class="bold">
<a name="x2042955"></a>value type</dt>
<dd>In query management, one
of the arguments passed to the extended interface. The value type specifies
the data type of the value associated with the keyword.</dd>
<dt id="x2005661" class="bold">
<a name="x2005661"></a>variable</dt>
<dd>A name used to represent
data that can be changed while the program or procedure is running. See also <a href="rzaatc.htm#x2000899">constant</a>.</dd>
<dt id="x2042963" class="bold">
<a name="x2042963"></a>variable buffer</dt>
<dd>A storage area used
to pass dialog variables between the application program and the user interface
manager (UIM).</dd>
<dt id="x2042968" class="bold">
<a name="x2042968"></a>variable data</dt>
<dd>In AFP&trade; Utilities, an
element in the record layout whose value is represented in the database file.
See also <a href="rzaatf.htm#x2023095">fixed data</a>.</dd>
<dt id="x2042973" class="bold">
<a name="x2042973"></a>variable length</dt>
<dd>The length of a record
or field that can be changed. See also <a href="rzaatf.htm#x2023114">fixed length</a>.</dd>
<dt id="x2042978" class="bold">
<a name="x2042978"></a>variable-length</dt>
<dd>Property of a record
or field that can have a varying length. See also <a href="rzaatf.htm#x2023119">fixed-length</a>.</dd>
<dt id="x2042983" class="bold">
<a name="x2042983"></a>variable-occurrence data item</dt>
<dd>In
COBOL, a table element that is repeated a variable number of times. Such an
item must contain an OCCURS DEPENDING ON clause in its data description entry,
or be subordinate to such an item.</dd>
<dt id="x2042988" class="bold">
<a name="x2042988"></a>variable pattern</dt>
<dd>In REXX, a parsing
pattern that uses variables to specify where a string of characters is parsed.
The value of the variable can be set by the user and can change while running.</dd>
<dt id="x2042993" class="bold">
<a name="x2042993"></a>variable pool</dt>
<dd>In the user interface
manager (UIM), the collection of dialog variables defined for an opened application
program.</dd>
<dt id="x2042998" class="bold">
<a name="x2042998"></a>variable pool interface</dt>
<dd>In REXX,
an application program interface that allows programs written in other languages
to access variables being used by or contained in an active REXX program.</dd>
<dt id="x2043003" class="bold">
<a name="x2043003"></a>variable record</dt>
<dd>The named element
of a panel group that identifies the content and layout for the storage area
of the dialog variables.</dd>
<dt id="x2043008" class="bold">
<a name="x2043008"></a>variable symbol</dt>
<dd>In a REXX exec, a
symbol that is assigned a value by the user or in some cases by the REXX/400
interpreter. The value of a variable symbol can be tested and changed using
control statements.</dd>
<dt id="x2005671" class="bold">
<a name="x2005671"></a>varying-length string</dt>
<dd>In DB2 UDB for iSeries, a character string whose length is not fixed, but variable within limits.
See also <a href="rzaatf.htm#x2001966">fixed-length string</a>.</dd>
<dt id="x2043026" class="bold">
<a name="x2043026"></a>varied off</dt>
<dd>Pertaining to a device,
controller, line, network interface, or independent disk pool unavailable
for its normal, intended use.</dd>
<dt id="x2210561" class="bold">
<a name="x2210561"></a>vary off</dt>
<dd>To make a device, control
unit, or line unavailable for its normal intended use.</dd>
<dt id="x2043031" class="bold">
<a name="x2043031"></a>varied on</dt>
<dd>See <a href="rzaata.htm#x2014872">available</a>.</dd>
<dt id="x2210566" class="bold">
<a name="x2210566"></a>vary on</dt>
<dd>To make an independent disk
pool available for its normal, intended use. All of the primary and secondary
disk pools in a disk pool group will vary on together.</dd>
<dt id="x2043036" class="bold">
<a name="x2043036"></a>VC</dt>
<dd>See <a href="rzaatv.htm#x2043138">virtual
circuit</a>.</dd>
<dt id="x2043053" class="bold">
<a name="x2043053"></a>vector</dt>
<dd>(1) In SNA, a data structure containing
three fields: a length field that specifies the length of the vector in which
it is contained, an identifier or type field, and a value field. The value
field may contain subvectors.</dd>
<dd>(2) In the GDDM&reg; function, a directed line segment, which
is a straight line between two points.</dd>
<dt id="x2043064" class="bold">
<a name="x2043064"></a>vector symbol set (VSS)</dt>
<dd>In the GDDM function, a set of characters each of which is treated as a small picture
and is described by a sequence of lines and arcs. Characters in a vector symbol
set can be drawn to scale, rotated, and positioned precisely. See also <a href="rzaati.htm#x2024953">image symbol set</a>.</dd>
<dt id="x2043069" class="bold">
<a name="x2043069"></a>Vendor Independent Messaging (VIM)</dt>
<dd>An application program interface (API) defined by Apple Computer, Inc.; Borland
International, Inc.; Lotus&reg; Development Corporation; and Novell, Inc.</dd>
<dt id="x2043074" class="bold">
<a name="x2043074"></a>Venn diagram</dt>
<dd>A graphic image consisting
of overlapping circles that represent the logical relationship of two sets
of information.</dd>
<dt id="x2043079" class="bold">
<a name="x2043079"></a>verb</dt>
<dd>A reserved word that expresses
an action to be taken by an application programming interface (API), a compiler,
or an object program.</dd>
<dt id="x2005676" class="bold">
<a name="x2005676"></a>version</dt>
<dd>A separately licensed program
that usually has significant new code or new function.</dd>
<dt id="x2043090" class="bold">
<a name="x2043090"></a>vertical format information</dt>
<dd>In TCP/IP,
information, such as tab markers, that automatically positions lines of text
with respect to other lines of text, according to defined rules. Vertical
format information is usually associated with word processing.</dd>
<dt id="x2043095" class="bold">
<a name="x2043095"></a>Vertical Licensed Internal Code (VLIC)</dt>
<dd>Programming that defines logical operations on data. The Vertical Licensed
Internal Code translates the machine interface (MI) instructions.</dd>
<dt id="x2043100" class="bold">
<a name="x2043100"></a>vertically displayed records</dt>
<dd>Subfile
records that are grouped so that each record is displayed on one or more lines.
Each record begins a new line.</dd>
<dt id="x2005681" class="bold">
<a name="x2005681"></a>view</dt>
<dd>(1) The form in which an object
is presented. A choice in the action bar that a user selects to look at an
object from various perspectives is an example of a view.</dd>
<dd>(2) An alternative
representation of data from one or more tables. A view can include all or
some of the columns in the table or tables on which it is defined.</dd>
<dt id="x2043114" class="bold">
<a name="x2043114"></a>viewport</dt>
<dd>In the GDDM function, a
rectangular area within the picture space that defines where the output of
the current page appears on the work station.</dd>
<dt id="x2043119" class="bold">
<a name="x2043119"></a>VIM</dt>
<dd>See <a href="rzaatv.htm#x2043069">Vendor
Independent Messaging</a>.</dd>
<dt id="x2043123" class="bold">
<a name="x2043123"></a>virtual</dt>
<dd>Pertaining to not physically
existing as such but made by software to appear to do so.</dd>
<dt id="x2043128" class="bold">
<a name="x2043128"></a>virtual address translation</dt>
<dd>The conversion
of virtual storage addresses to real storage addresses.</dd>
<dt id="x2043133" class="bold">
<a name="x2043133"></a>virtual call</dt>
<dd>An X.25 user facility
in which a call setup procedure and a call clearing procedure determine a
period of communications between two DTEs in which the users' data will be
transferred in the network in the packet mode of operation. All the users'
data is delivered from the network in the same order in which it is received
by the network. Synonym for switched virtual call.</dd>
<dt id="x2043138" class="bold">
<a name="x2043138"></a>virtual circuit (VC)</dt>
<dd>In a packet-switching
data network, a logical end-to-end transmission channel--as opposed to a physical
connection--that connects X.25 users. Virtual circuits allow physical transmission
facilities to be shared by many users simultaneously. A virtual circuit is
a logical connection established between two DTEs. See also <a href="rzaatp.htm#x2033660">physical circuit</a>.</dd>
<dt id="x2043143" class="bold">
<a name="x2043143"></a>virtual controller</dt>
<dd>(1) A controller description
that is used by Advanced Peer-to-Peer Networking&reg; (APPN) and
high-performance routing (HPR) support to attach and manage APPN device descriptions.
This type of controller does not represent a connection to a remote station.</dd>
<dd>(2) A controller description that emulates the function of a physical
controller for communication with a remote device. As an example, when a PC
is attached to a system, a virtual controller must be created to allow the
PC to communicate with the system.</dd>
<dt id="x2043151" class="bold">
<a name="x2043151"></a>virtual device</dt>
<dd>A device description
that does not have hardware associated with it. It is used to form a connection
between a user and a physical work station attached to a remote system. A
virtual device can be a virtual display station or a virtual printer.</dd>
<dt id="x2235406" class="bold">
<a name="x2235406"></a>virtual image</dt>
<dd>A CD or DVD image that
is stored on system disks. Virtual images are stored in the integrated file
system and can be in either Universal Disk Format (UDF) or ISO 9660 format.</dd>
<dt id="x2043165" class="bold">
<a name="x2043165"></a>virtual machine (VM)</dt>
<dd>A functional
simulation of a computer and its associated devices.</dd>
<dt id="x2043173" class="bold">
<a name="x2043173"></a>virtual node</dt>
<dd>The node associated
with a connection network when a route is calculated that goes through that
connection network.</dd>
<dt id="x2210258" class="bold">
<a name="x2210258"></a>virtual optical device</dt>
<dd>An optical
device of type 632B that supports virtual optical images. This device can
be created with the Create Device Description (Optical) (CRTDEVOPT) command
by using a resource name (RSRCNAME) of *VRT.</dd>
<dt id="x2235401" class="bold">
<a name="x2235401"></a>virtual optical storage</dt>
<dd>Storage on
system disks that appears to the user to be storage on an actual CD or DVD.</dd>
<dt id="x2043178" class="bold">
<a name="x2043178"></a>virtual party</dt>
<dd>In telephony, a party
that does not actually take part in a telephone call. A virtual party is represented
by a special directory number or numbers.</dd>
<dt id="x2043183" class="bold">
<a name="x2043183"></a>virtual printer</dt>
<dd>In iSeries Access, a
printer attached to a host system that can receive output from a personal
computer for printing. A virtual printer allows a user to use a printer attached
to the host system as though the printer were directly attached to a personal
computer.</dd>
<dt id="x2043188" class="bold">
<a name="x2043188"></a>virtual private network (VPN)</dt>
<dd>An
extension of a company's intranet over the existing framework of either a
public or private network. A VPN ensures that the data that is sent between
the two endpoints of its connection remains secure.</dd>
<dt id="x2069994" class="bold">
<a name="x2069994"></a>virtual processor</dt>
<dd>A setting that
defines the assigned processing capacity represented to the operating system.
Virtual processors represent a processing capacity less than that of a physical
processor. A logical partition in the shared processor pool must have at
least as many virtual processors as its assigned processing capacity.</dd>
<dt id="x2043196" class="bold">
<a name="x2043196"></a>virtual storage (VS)</dt>
<dd>The storage
space that can be regarded as addressable main storage by the user of a computer
system in which virtual addresses are mapped into real addresses. The size
of virtual storage is limited by the addressing scheme of the computer system
and by the amount of auxiliary storage available, not by the actual number
of main storage locations.</dd>
<dt id="x2005691" class="bold">
<a name="x2005691"></a>Virtual Storage Access Method (VSAM)</dt>
<dd>An IBM&reg; licensed program that controls communication and the flow of data
in an SNA network. It provides single-domain, multiple-domain, and interconnected
network capability. VSAM is emulated in CICS&reg; to control access to files.</dd>
<dt id="x2043201" class="bold">
<a name="x2043201"></a>virtual terminal</dt>
<dd>A system object,
created and controlled by an application program, that provides a functional
representation or simulation of a physical display station.</dd>
<dt id="x2043211" class="bold">
<a name="x2043211"></a>virtual terminal manager (VTM)</dt>
<dd>A
Vertical Licensed Internal Code component that provides an interface to handle
input/output to virtual devices on the system.</dd>
<dt id="x2043206" class="bold">
<a name="x2043206"></a>virtual terminal manager/function manager (VTM/FM)</dt>
<dd>The function that provides an application program interface to
terminal handling components residing below the machine interface on the system.</dd>
<dt id="x2043216" class="bold">
<a name="x2043216"></a>virtual workstation controller</dt>
<dd>A
work station controller description that has the characteristics of a locally
attached work station controller but does not exist as hardware.</dd>
<dt id="x2043221" class="bold">
<a name="x2043221"></a>virus</dt>
<dd>A program that can change other
programs to include a copy of itself. The other programs are then said to
be infected by the virus. Additionally, the virus can perform other operations
that can take up system resources or destroy data.</dd>
<dt id="x2005701" class="bold">
<a name="x2005701"></a>Visual Explain</dt>
<dd>A tool that lets database
administrators and application programmers use a graphical interface to display
and analyze detailed information on the access plan of a given SQL statement.
The tasks provided by this tool can be accessed from the Control Center.</dd>
<dt id="x2043236" class="bold">
<a name="x2043236"></a>vital product data (VPD)</dt>
<dd>(1) In System
Manager, self-defining information stored within the licensed programs, Licensed
Internal Code groups, and hardware elements that comprise a system.</dd>
<dd>(2) A structured description of a device or program. For devices, it is
recorded in the device at manufacture and includes at least the type, model,
serial number, and installed features. It may include the manufacturer's ID
and other fields. For programs, it is compiled as a data area accompanying
the program and includes the name of the licensed program or Licensed Internal
Code group, the release and modification, the program module names, the national
language or languages selected, and possibly other fields. Vital product data
is transferred from the device to the system and stored for display. Vital
product data is also visible on the device name plate or a similar tag.</dd>
<dt id="x2043244" class="bold">
<a name="x2043244"></a>VLIC</dt>
<dd>See <a href="rzaatv.htm#x2043095">Vertical
Licensed Internal Code</a>.</dd>
<dt id="x2043248" class="bold">
<a name="x2043248"></a>VLIC log</dt>
<dd>A list of problem analysis
information created by Vertical Licensed Internal Code.</dd>
<dt id="x2043253" class="bold">
<a name="x2043253"></a>VM</dt>
<dd>See <a href="rzaatv.htm#x2043165">virtual
machine</a>.</dd>
<dt id="x2043257" class="bold">
<a name="x2043257"></a>VM/MVS bridge</dt>
<dd>A function of the Communications
Utilities for i5/OS&trade; licensed program that provides distribution services
between an i5/OS SNADS network and both a VM Remote Spooling Communications Subsystem
(RSCS) network and a Multiple Virtual Storage/Job Entry Subsystem (MVS/JES)
network.</dd>
<dt id="x2043262" class="bold">
<a name="x2043262"></a>voice-grade telephone line</dt>
<dd>A telephone
line that is normally used for voice communications. The line requires a modem
for data communications.</dd>
<dt id="x2043267" class="bold">
<a name="x2043267"></a>voice response unit (VRU)</dt>
<dd>Hardware
and software used to answer incoming calls by playing one or more prerecorded
messages.</dd>
<dt id="x2043272" class="bold">
<a name="x2043272"></a>volume</dt>
<dd>A storage medium that is put
on or taken off the system as a unit, for example, magnetic tape or diskette.</dd>
<dt id="x2043277" class="bold">
<a name="x2043277"></a>volume label</dt>
<dd>An area on tape or disk
that is used to identify the tape volume and its owner.</dd>
<dt id="x2043282" class="bold">
<a name="x2043282"></a>volume statistics</dt>
<dd>Statistical information
about the activity on a tape, diskette, or cartridge volume including statistics
about the session (such as the number of read, write, and retry operations),
and lifetime (accumulated) statistics (such as the number of read and write
errors and the number of bytes read and written).</dd>
<dt id="x2043287" class="bold">
<a name="x2043287"></a>volume table of contents (VTOC)</dt>
<dd>(1) In the DYNIX/ptx&reg; operating system, a partitioning driver. A VTOC file contains
disk geometry information and defines the sizes and starting points of partitions
on a disk.</dd>
<dd>(2) An area on a disk or diskette that describes the location,
size, and other characteristics of each file, library, and folder on the disk
or diskette.</dd>
<dt id="x2043292" class="bold">
<a name="x2043292"></a>vote</dt>
<dd>In the two-phase commit protocol,
the response of an agent to the request of the initiator. The application
transaction program uses the responses to determine if it should commit or
roll back its protected resources.</dd>
<dt id="x2043297" class="bold">
<a name="x2043297"></a>voted read-only (VRO)</dt>
<dd>The voted read-only
logical unit of work (LUW) state indicates that the current LUW had no pending
changes, was allowed to vote read-only, and did so.</dd>
<dt id="x2043302" class="bold">
<a name="x2043302"></a>vote read-only</dt>
<dd>The response, to a
Prepare presentation services header with a Forget presentation services header,
by the agent when no changes have been made to the resources, for the optimization
of the two-phase commit flows.</dd>
<dt id="x2043307" class="bold">
<a name="x2043307"></a>VPD</dt>
<dd>See <a href="rzaatv.htm#x2043236">vital
product data</a>.</dd>
<dt id="x2043311" class="bold">
<a name="x2043311"></a>VPN</dt>
<dd>See <a href="rzaatv.htm#x2043188">virtual
private network</a>.</dd>
<dt id="x2047932" class="bold">
<a name="x2047932"></a>VRO</dt>
<dd>See <a href="rzaatv.htm#x2043297">voted
read-only</a>.</dd>
<dt id="x2043315" class="bold">
<a name="x2043315"></a>VRU</dt>
<dd>See <a href="rzaatv.htm#x2043267">voice
response unit</a>.</dd>
<dt id="x2043319" class="bold">
<a name="x2043319"></a>VS</dt>
<dd>See <a href="rzaatv.htm#x2043196">virtual
storage</a>.</dd>
<dt id="x2009744" class="bold">
<a name="x2009744"></a>VSAM</dt>
<dd>See <a href="rzaatv.htm#x2005691">Virtual
Storage Access Method</a>.</dd>
<dt id="x2043325" class="bold">
<a name="x2043325"></a>V-Series Recommendations</dt>
<dd>A document,
CCITT Recommendation V-Series, that outlines standards for the interface between
data terminal equipment (DTE) and a synchronous modem.</dd>
<dt id="x2043330" class="bold">
<a name="x2043330"></a>VSS</dt>
<dd>See <a href="rzaatv.htm#x2043064">vector
symbol set</a>.</dd>
<dt id="x2043346" class="bold">
<a name="x2043346"></a>VT100</dt>
<dd>A character-mode work station.
Characters are sent immediately to the host system when a key is pressed.</dd>
<dt id="x2043351" class="bold">
<a name="x2043351"></a>VT100 workstation protocol</dt>
<dd>i5/OS support for
the VT100 work station protocol that allows a user to access, using TELNET
VT100 client support, VT100 application programs on other systems in a TCP/IP
network. Users on other systems with a TELNET VT100 client emulation package
are able to access i5/OS application programs through the i5/OS TELNET VT100
server.</dd>
<dt id="x2043356" class="bold">
<a name="x2043356"></a>VT220</dt>
<dd>A character-mode work station.
Characters are sent immediately to the host system when a key is pressed.</dd>
<dt id="x2043361" class="bold">
<a name="x2043361"></a>VT220 workstation</dt>
<dd>An ASCII full-screen
workstation manufactured by Digital Equipment Corporation (DEC).</dd>
<dt id="x2043366" class="bold">
<a name="x2043366"></a>VT220 workstation protocol</dt>
<dd>i5/OS support for
the VT220 work station protocol that allows a user to access, using TELNET
VT220 client support, VT220 application programs on other systems in a TCP/IP
network. Users on other systems with a TELNET VT220 client emulation package
are able to access i5/OS application programs through the i5/OS TELNET VT220
server.</dd>
<dt id="x2043334" class="bold">
<a name="x2043334"></a>VTM</dt>
<dd>See <a href="rzaatv.htm#x2043211">virtual
terminal manager</a>.</dd>
<dt id="x2043338" class="bold">
<a name="x2043338"></a>VTM/FM</dt>
<dd>See <a href="rzaatv.htm#x2043206">virtual terminal manager/function manager</a>.</dd>
<dt id="x2043342" class="bold">
<a name="x2043342"></a>VTOC</dt>
<dd>See <a href="rzaatv.htm#x2043287">volume
table of contents</a>.</dd></dl>
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