The debugger's DECwindows Motif interface is layered on the command
  interface.  The command-entry prompt (DBG>), located in the command
  view, lets you enter debugger commands for the following purposes:

   -  As an alternative to using the DECwindows Motif interface for
      certain operations

   -  To do debugging tasks not available through the DECwindows Motif
      interface

  When you use the DECwindows Motif interface, the debugger translates
  your input into debugger commands.  These commands are echoed in the
  command view, at the prompt, so that you can correlate your input with
  the corresponding command line that the debugger processes.  Echoed
  commands are visually indistinguishable from commands that you enter
  explicitly.

  In addition to entering debugger commands interactively at the prompt,
  you can also enter them in debugger initialization files and command
  files for execution under the DECwindows Motif environment.