If you invoked the debugger with the DCL command DEBUG/KEEP and
    subsequently used the debugger RUN command to begin debugging
    your program, you can then use the RERUN command to rerun the
    program currently under debugger control.

    The RERUN command terminates the image you were debugging and
    then restarts that image under debugger control. Execution is
    paused at the start of the main program unit, as if you had used
    the debugger RUN command or the DCL command RUN/DEBUG.

    The RERUN command uses the same version of the image that is
    currently under debugger control. To debug a different version
    of that program (or a different program) from the same debugging
    session, use the RUN command.

    Related commands:

       RUN (debugger command)
       RUN (DCL command)
       (ACTIVATE,DEACTIVATE) BREAK
       (ACTIVATE,DEACTIVATE) TRACE
       (ACTIVATE,DEACTIVATE) WATCH