Syntax:  SET PLACEHOLDER MENU LINE body_string description
              menu_line_type list_boolean add_remove
              defined_placeholder defined_language

  Specifies a line of menu that is displayed when a menu-type
  placeholder is expanded.

  Each line of the body of a menu placeholder represents one option in
  the menu.  When you expand a menu-type placeholder, you can select
  one option from the menu.  An option can be a string of text, a
  token, or a placeholder name.  If a text option is selected, the
  placeholder will be replaced by that text.  If a placeholder option
  is selected, the selected name, enclosed in placeholder delimiters,
  will be substituted.  If a token is selected, the token name will be
  substituted.

  If the menu option given is a placeholder, then you can indicate
  whether it should be expanded as a list placeholder or not.