Invokes the VMS Debugger after program execution is interrupted by
 Ctrl/Y, but only if the /NOTRACEBACK qualifier was not specified
 with the LINK command when the program was linked.

 To get help on debugger commands from DCL level, type the following
 command:

     $ HELP/LIBRARY=SYS$HELP:DBG$HELP

 Format

     DEBUG

Additional information available:

Example

  $ FORTRAN/DEBUG/NOOPTIMIZE WIDGET
  $ LINK/DEBUG WIDGET
  $ RUN/NODEBUG WIDGET

  NAME:
  NAME:
  NAME:
  ^Y
  $ DEBUG

              VAX DEBUG Version V5.5

  %DEBUG-I-INITIAL, language is FORTRAN, module set to WIDGET
  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.