When you complete your edits, and save these to your file by choosing
  the Save or Save As items from the editor's File menu, you need to
  recompile and relink your source file.

  You do not need to exit the debugger to do this.

  Enter the compile and link commands in another DECterm window, and when
  you return to the debugger, choose the Rerun Same item in the File menu
  on the main window.  Your edited source code will appear in the
  debugger's source view.