By default, a Q720 message will be logged to the application event log when LGOFFUSR.286 logs off or disconnects a user from a 4690 console. The event field will contain a "1" if the operation was successful. The event field will contain a 3 or 4 if the operation failed. If the operation failed, the return code will be in the Unique Data Field of the message.
By default, a Q721 message will be logged to the application event log when TSIGNOFF.286 signs off a terminal. The ASCII data field will contain the terminal number.