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<h4 class="subsection">8.2.4 Concurrent Remote Calls</h4>
<p>It is not defined by the PCS specification whether one or more threads
of control should be available to process incoming messages and to wait
for their completion. But the PCS implementation is required to be
reentrant, thereby allowing concurrent calls on it to service concurrent
remote subprogram calls into the server partition. This means that at
the implementation level the PCS manages a pool of helper tasks. This
(apart from performance) is invisible to the user.
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