Parameter

string

   Specifies the new prompt string. The following rules apply:

   o  All valid ASCII characters can be used.

   o  No more than 64 characters are allowed.

   o  To include spaces or lowercase letters, enclose the string
      in quotation marks (" ").  Otherwise, letters are converted
      automatically to uppercase; leading and trailing spaces are
      removed.

   If you do not specify the string parameter with the SET PROMPT
   command, the default DCL prompt ($  ) is restored.