Library /sys$common/syshlp/dbg$uihelp.hlb DEBUGUI, exec_paused  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  To determine where execution is currently paused within your program:

  1.  If the current-location pointer is not visible in the source view,
      click on the Call Stack menu of that window to display the pointer.

  2.  Look at the current-location pointer:

       -  If the pointer is filled in, it marks the source line whose
          code will execute next.  The Call Stack menu always shows the
          routine at level 0 (where execution is paused) when the pointer
          is filled in.

       -  If the pointer is cleared, the source code displayed is that of
          a calling routine, and the pointer marks the source line to
          which execution returns in that routine as follows:

           +  If the Call Stack menu shows level 0, source code is not
              available for display for the routine in which execution is
              paused.

           +  If the Call Stack menu shows a level other than 0, you are
              displaying the source code for a calling routine.

  To list the sequence of routine calls that are currently active on the
  call stack, click on the Call Stack menu.  Level 0 denotes the routine
  in which execution is paused, level 1 denotes the calling routine, and
  so on.