TCO CNT Edit exit routine

You can use the TCO CNT Edit exit routine DFSTCNT0 to restrict users (LTERMs) from loading TCO scripts.

When IMS loads a TCO script, IMS calls the CNT exit routine to validate the load request. If the routine rejects the load request, IMS sends an error message to the terminal attempting to load the script.

You do not need to write your own exit routine if you do not want to restrict any users from loading TCO scripts. IMS provides a default exit routine, DFSTCNT0, that is always called unless it is replaced with a customized exit routine. The default exit routine allows all users to load TCO scripts.

You can write your own exit routine to authorizes certain users (LTERMs) to load TCO scripts. You must name the exit routine DFSTCNT0 and replace the default routine.

IMS uses the DFSTCNT0 exit routine instead of the Message Switching (Input) Edit exit routine when the message switching destination is DFSTCF.

IMS does not use RACF® to determine authorization loading for TCO scripts.