You can use the MONITOR command only with the debugger's HP
    DECwindows Motif for OpenVMS user interface, because the output
    of that command is directed at the monitor view. With the command
    interface, you typically use the EVALUATE, EXAMINE or SET WATCH
    command instead.

    The MONITOR command does the following:

    1. Displays the monitor view (if it is not already displayed by a
       previous MONITOR command).

    2. Puts the name of the specified variable or expression and its
       current value in the monitor view.

    The debugger updates the monitor view whenever the debugger
    regains control from the program, regardless of whether the value
    of the variable or location you are monitoring has changed. (By
    contrast, a watchpoint halts execution when the value of the
    watched variable changes.)

    For more information about the monitor view and the MONITOR
    command, see context-sensitive Help.

    Related commands:

       DEPOSIT
       EVALUATE
       EXAMINE
       SET WATCH