Retrieve Watch List (QSCRWCHL) generates a list of all or some watch sessions on the system.
Start Watch (QSCSWCH) starts the watch for event function, which notifies the user by calling a user specified program when the specified event (a message or LIC log) occurs.
Watch for Event is started by the STRWCH command or the Start Watch (QSCSWCH) API, and has the capability to notify the user by calling a user exit program when the specified event occurs.
Watch for Trace Event is called while using commands to watch for specific events, such as messages being sent to a particular queue.