====header tag==== It is often very useful to want to reuse a certain set of macro calls in every passage, or to reuse an opening block of text. You can do this by giving the passage the special tag ''%%header%%'', or ''%%footer%%''. All passages with these tags will have their source text included at the top (or, for ''%%footer%%'', the bottom) of every passage in the story, as if by an invisible [[harlowe:display|(display:)]] macro call. If many passages have the ''%%header%%'' tag, they will all be displayed, ordered by their passage name, sorted alphabetically, and by case (capitalised names appearing before lowercase names).