_userID and sends an optional response;
   it does nothing if called by a non-queue-manager.</td>
</tr>
<tr>
<td colspan="2" class="idxrow"><a onclick="javascript:loadClassListFrame('com/adobe/rtc/sharedModel/userQueueClasses/class-list.html');" href="com/adobe/rtc/sharedModel/userQueueClasses/UserQueueItem.html#descriptor">descriptor</a> &mdash; Property in class com.adobe.rtc.sharedModel.userQueueClasses.<a onclick="javascript:loadClassListFrame('com/adobe/rtc/sharedModel/userQueueClasses/class-list.html'