The End Request (ENDRQS) command cancels a local or source operation (request) that is currently stopped at a breakpoint.
This means the command cancels an application requester operation or request. You can cancel a request by entering ENDRQS on a command line or you can select option 2 from the System Request menu.
If it cannot be processed immediately because a server function that cannot be interrupted is currently running, the command waits until interruption is allowed.
When a request is ended, an escape message is sent to the request processing program that is currently called at the request level being canceled. Request processing programs can monitor for the escape message so that cleanup processing can be done when a request is canceled. The static storage and open files are reclaimed for any program that was called by the request processing program. None of the programs called by the request processing program are notified of the cancellation, so they have no opportunity to stop processing.