The debugger has a DECwindows Motif interface for workstations.
    When using this interface, you interact with the debugger by
    using a mouse and pointer to choose items from menus, click
    on buttons, select names in windows, and so on. The default
    DECwindows interface provides the basic debugging and convenience
    features that you will need most of the time.

    You can customize the DECwindows Motif interface with many of
    the special features of the command interface by modifying the
    control-panel buttons and their associated commands or by adding
    new buttons. You can customize other DECwindows Motif interface
    features by modifying the debugger resource file (DECW$USER_
    DEFAULTS:VMSDEBUG.DAT).

    Occasionally, you may find you prefer to disable the DECwindows
    interface, in order to use the somewhat faster command-line
    interface. If you redefine the DBG$DECW$DISPLAY logical name,
    as follows, you can use the debugger command-line interface while
    retaining a windows interface for your application:

    $ DEFINE DBG$DECW$DISPLAY " "

    For complete information about the DECwindows Motif interface,
    see the debugger's DECwindows Motif documentation.