You can use the MODIFY EXIT command to activate or deactivate an exit without interrupting VTAM® processing. You can activate or deactivate an exit that was loaded during VTAM initialization, or that was activated or deactivated with an earlier MODIFY EXIT command.

If the MODIFY EXIT command is successful, message IST984I indicates the exit's status. Otherwise, one of the following messages is issued: IST985I, IST452I, IST453I, IST454I, IST456I. See z/OS Communications Server: SNA Messages for more information.

An exit might become inactive during processing without a MODIFY EXIT command having been issued. In this case, message IST984I indicates that the exit is inactive.