/NOTIFY
       /NONOTIFY (default)

    Controls whether a message is broadcast to your terminal
    notifying you that your subprocess has completed or aborted. This
    qualifier should not be used unless you specify the /NOWAIT qualifier.
    The /NOTIFY qualifier cannot be specified when the SPAWN command is
    executed from within a noninteractive process.

    Note that messages broadcast as a result of using the /NOTIFY
    qualifier are considered to be DCL messages. Therefore, if SET
    BROADCAST=NODCL is in effect, all such notification messages
    are suppressed.