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<h1 class="topictitle1">API terminology</h1>
<div><p>Before using the iSeries™ APIs, you should be familiar with several
terms. These terms refer to <span class="keyword">i5/OS™</span> objects.</p>
<div class="section"><p>The system-recognized identifiers are shown in parentheses. Note
that each term does not apply to every API.</p>
<dl><dt class="dlterm">binding directory (*BNDDIR).</dt>
<dd>An object that contains a list of names of modules and service programs.</dd>
<dt class="dlterm">data queue (*DTAQ).</dt>
<dd>An object that is used to communicate and store data used by several programs
in a job or between jobs.</dd>
<dt class="dlterm">module (*MODULE).</dt>
<dd>An object that is made up of the output of the compiler.</dd>
<dt class="dlterm">program (*PGM).</dt>
<dd>A sequence of instructions that a computer can interpret and run. A program
can contain one or more modules.</dd>
<dt class="dlterm">service program (*SRVPGM).</dt>
<dd>An object that packages externally supported callable routines into a
separate object.</dd>
<dt class="dlterm">user index (*USRIDX).</dt>
<dd>An object that provides a specific order for byte data according to the
value of the data.</dd>
<dt class="dlterm">user queue (*USRQ).</dt>
<dd>An object consisting of a list of messages that communicate information
to other application programs. Only programming languages that can use machine
interface (MI) instructions can access *USRQ objects.</dd>
<dt class="dlterm">user space (*USRSPC).</dt>
<dd>An object consisting of a collection of bytes used for storing any user-defined
information.</dd>
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<div class="parentlink"><strong>Parent topic:</strong> <a href="concept.htm" title="Describes the underlying concepts that you need to understand to work effectively with APIs. Among the concepts covered are basic concepts, programming considerations, and terminology.">API concepts</a></div>
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