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<h1 class="topictitle1">Job message queues</h1>
<div><p>Job message queues are created for each job on the system to handle
all the message requirements of the job. Job message queues for a single
job consist of an external message queue (*EXT) and a set of call message
queues. </p>
<p>A call message queue is assigned to each ILE procedure and OPM program
that is called within the job. In addition, a job log is created for each
job. A job log is a logical queue which maintains all messages sent within
a job in chronological order. You may send messages to the *EXT queue or to
a call message queue. You do not send messages to the job log. Rather a message
sent to either *EXT or a call message queue is also logically added to the
job log by the system.</p>
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<ul class="ullinks">
<li class="ulchildlink"><strong><a href="msgextqueue.htm">External message queue (*EXT)</a></strong><br />
The external message queue (*EXT) is used to communicate with the external requester (such as a display station user) of the job.</li>
<li class="ulchildlink"><strong><a href="msgcallqueue.htm">Call message queue</a></strong><br />
A call message queue is used to send messages between one program or procedure and another program or procedure.</li>
</ul>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="msgusequeues.htm" title="This covers the types of message queues, how to create or change a message queue, and details about job message queues.">Use message queues</a></div>
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<div class="relconcepts"><strong>Related concepts</strong><br />
<div><a href="tmtmq.htm" title="All messages on the system are sent to a message queue.">Types of message queues</a></div>
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