SUSPENDING, Suspending processing on user request or attempt to do terminal I/O while running in the background
Run Time Information: The message signifies that a GT.M process is suspended on user initiated ^Z (or key stroke that is set to shell "susp"). It is also displayed if the process attempts to do terminal I/O while running in the background. Before suspending itself, the process logs the SUSPENDING message to the operator facility. Suspended processes may be automatically released from that state if they hold a shared resource that blocks other processes.