o-operating
&quot;pseudo-thread&quot; also enters the meeting so the datum exchange can take
place, or until the meeting-close procedure is applied.  Once a datum
exchange has taken place, a meeting object can be reused for making
another exchange (provided the meeting object has not been closed).
</p>
<p>Synchronization occurs at the moment that the exchange of the datum
takes place.  Once one of the &quot;pseudo-threads&quot; leaves the meeting upon
meeting-receive or meeting-send (or both) returning, all