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