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<h1 class="topictitle1">DRDA TCP/IP
server terminology</h1>
<div><p>The same server software is used for both DDM and DRDA<sup>®</sup> TCP/IP access
to <span class="keyword">DB2 Universal Database™ for iSeries™</span>. </p>
<div class="section"><p>For brevity, the term <em>DDM server</em> is used rather than <em>DRDA/DDM
server</em> in the following discussion. Sometimes, however, it might be referred
to as the <em>TCP/IP server</em>, the <em>DRDA server</em>, or the <em>server</em> when
the context makes the use of a qualifier unnecessary.</p>
</div>
<div class="section"><p>The DDM server consists of two or more jobs, one of which is what
is called the DDM <em>listener</em>, because it listens for connection requests
and dispatches work to the other jobs. The other job or jobs, as initially
configured, are prestart jobs which service requests from the DRDA or DDM client
after the initial connection is made. The set of all associated jobs, the
listener and the server jobs, are collectively referred to as the <em>DDM server</em>.</p>
</div>
<div class="section"><p>The term <em>client</em> is used interchangeably with <em>DRDA Application
Requester</em> (or AR) in the DRDA application environment. The term client will be
used interchangeably with <em>DDM source system</em> in the DDM (distributed
file management) application environment.</p>
</div>
<div class="section"><p><img src="./delta.gif" alt="Start of change" />The term <em>server</em> is used interchangeably
with <em>DRDA Application
Server</em> (or AS) in the DRDA application environment. The term server will be
used interchangeably with <em>DDM target system</em> in the DDM application
environment. (Note that in some contexts, the iSeries system (the hardware) is also
called a server, or the iSeries server.)<img src="./deltaend.gif" alt="End of change" /></p>
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<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="rbal1mtserv.htm" title="This topic collection describes how to manage the DRDA/DDM server jobs that communicate using sockets over TCP. It describes the subsystem in which the server runs, the objects that affect the server and how to manage those resources.">Manage the TCP/IP server</a></div>
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