Syntax:  SET PLACEHOLDER HELP TOPIC help_topic defined_placeholder
              defined_language

  Sets the help topic string for the given placeholder.

  This command specifies a string that LSE uses to to retrieve help
  text for a placeholder.  The help topic string is appended to the
  string you specify with the SET LANGUAGE HELP TOPIC command to form
  the complete string of topics that LSE uses for looking up the help
  text for this placeholder.

  RELATED COMMANDS:

     EXTRACT PLACEHOLDER         SET LANGUAGE HELP TOPIC
     NEW PLACEHOLDER             SHOW PLACEHOLDER