This attribute specifies whether or not to maintain a queue of events generated by the managed widgets. An event queue is required when either multiple events managed by the SYSTEM widget have the same event handler or the SYSTEM widget manages a number of widgets that have the same event name.
The event queue prevents the loss of events generated while servicing others. The only limit on queue size is the available memory. When event queuing is enabled, you must empty the queue with some combination of the "*QUEUED EVENT" and "*FLUSH QUEUED EVENTS" attributes. Setting "*QUEUE EVENTS" to "0" destroys an existing event queue.
