PROMPT [ CHARACTER IS prompt-lit ]
  1. The PROMPT phrase causes the input field to be filled with the specified prompt character prior to entry. If the prompt character is omitted, underscores are used.
  2. If the DEFAULT phrase is also used, then the prompt character replaces any trailing spaces in the field.
  3. The PROMPT phrase is automatically used for every entry in the Screen Section. Thus this phrase is treated as commentary in the Screen Section unless it specifies a prompt character other than underscores.