The following commands are used to start the debugger, bring
    a program under debugger control, and interrupt and end a
    debugging session. Except where the DCL RUN and DEBUG commands
    are indicated specifically, all commands are debugger commands.

    DEBUG/KEEP (DCL RUN    Starts the debugger
    command)
    RUN program-image      Brings a program under debugger control
    RERUN                  Reruns the program currently under
                           debugger control
    RUN program-image      If the specified image was linked using
    (DCL RUN command)      LINK/DEBUG, starts the debugger and also
                           brings the image under debugger control.
                           When you start the debugger in this
                           manner, you cannot then use the debugger
                           RUN or RERUN commands. You can use the
                           /[NO]DEBUG qualifiers with the RUN command
                           to control whether the debugger is started
                           when the program is executed.
    EXIT, Ctrl/Z           Ends a debugging session, executing all
                           exit handlers
    QUIT                   Ends a debugging session without executing
                           any exit handlers declared in the program
    Ctrl/C                 Aborts program execution or a debugger
                           command without interrupting the debugging
                           session
    (SET,SHOW) ABORT_KEY   (Assigns, identifies) the default Ctrl/C
                           abort function to another Ctrl-key
                           sequence, identifies the Ctrl-key sequence
                           currently defined for the abort function
    Ctrl/Y-DEBUG           Interrupts a program that is running
    (DCL DEBUG command)    without debugger control and starts the
                           debugger
    ATTACH                 Passes control of your terminal from the
                           current process to another process
    SPAWN                  Creates a subprocess, enabling you to
                           execute DCL commands without ending a
                           debugging session or losing your debugging
                           context