The function returns the number of requests for starting the event instance or executing the RPC procedure.

The use of this function depends on the object which includes the ESL script.
If the ESL script is placed in the object of the Event type that is started to the change of object value, the function returns the number of requests to start an event, if the request queue to start the event is enabled, or -1, if the queue is disabled.

If the ESL script is placed in the object of the Event type whose parameter ServerEvent is enabled, or in the object of the Picture type, the function returns the number of pending requests to execute RPC procedures.