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<h1 class="topictitle1">DDM terminology</h1>
<div><p>The same server is used for both DDM and DRDA<sup>®</sup> TCP/IP access to <span class="keyword">DB2 Universal Database™ for iSeries™</span>.</p>
<p>For brevity, the term <em>DDM server</em> will be used rather than <em>DRDA/DDM
server</em> in the following discussion. Sometimes, however, it may 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>
<p>The DDM server consists of two or more jobs, one of which is what is called
the DDM <em>listener</em> (or daemon), 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>
<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>
<p>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 (distributed
file management) application environment.</p>
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rbae5mtserv.htm" title="These topics describe how to manage the DRDA and 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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