This exit allows you to provide an exit routine to receive control every time that JES2 is ready to queue a $WTO message for transmission. If this exit is implemented and enabled, it receives control for all messages destined for remote stations and for other systems, as well as for all messages with a destination of local.

However, this exit does not receive control for messages generated by the subsystem interface or functional subsystem modules.

You can use your exit routine to interrogate the message's console message buffer (CMB) and, based on this interrogation, direct JES2 either to cancel the message or to queue it for normal transmission. You can also use your exit routine to change the text of the message or to alter its console routing.