Mod OnAnyPage, a moduie available from the extensions directory, makes it possible to control on which pages a module is displayed regardless of the normal Joomla system of menu assignment of modules. Part of the functionality is that a module can be displayed only with one or more specific articles, whether or not those articles are associated with a menu item. In most cases, using this module will be an easier, quicker and better solution than what is explained in the article.
Added this to the article. Thanks for the tip! Mark Dexter 19:13, 12 November 2008 (EST)