VMS Help SET, PROMPT, Example  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  $ SET PROMPT ="What's next?"
  What's next? SHOW TIME
   19-APR-2001 14:08:58

      The SET PROMPT command in this example replaces the DCL prompt
      ($  ) with the phrase "What's next?". When you see the prompt
      on your screen, you can enter any DCL command. This example
      uses the SHOW TIME command.