Invokes the VAX/VMS Debugger after program execution is  interrupted
  by  CTRL/C  or  CTRL/Y.  For a  complete  description of the VAX/VMS
  Debugger, including more information  about  the  DEBUG command, see
  the VAX/VMS Debugger Reference Manual.

  Format:

    DEBUG

Additional information available:

Examples

  1.   $ FORTRAN/DEBUG/NOOPTIMIZE   WIDGET
       $ LINK/DEBUG  WIDGET
       $ RUN WIDGET

          VAX DEBUG Version V04-000

       _%DEBUG-I-INITIAL, language is FORTRAN, module set to 'WIDGET'
       DBG>GO
       ENTER NAME:
       ENTER NAME:
       ENTER NAME:
       ^Y
       $ DEBUG
       DBG>

  The FORTRAN and LINK commands both specify the /DEBUG  qualifier  to
  compile   the   program   WIDGET.FOR   with  debugger  symbol  table
  information and to include the debugger in the image file.  The  RUN
  command  begins  execution  of  the  image  WIDGET.EXE,  which loops
  uncontrollably.   CTRL/Y  interrupts  the  program,  and  the  DEBUG
  command gives control to the debugger.