To start the debugger, enter the following command from DCL level:

    $ DEBUG/KEEP

  This startup method enables you to rerun your program or run another
  program from the same debugging session without exiting the debugger.

  Additional options for starting the debugger are discussed in the
  manual provided with this debugger.  With some of these startup
  methods, you cannot rerun your program or run another program from the
  same debugging session.