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EHEH, well, you must hack header.php and footer.php, plea read the readme.txt. Then you need to create what I call a 'page'. A page can be a specific page or a set of pages like all module pages. It depends on the use of the * in the url field of the created page.
After creating a page, you can use it on the theme tab, permissions tab or metadata tab. Defacer allows you to change your theme, metadata, and access permissions to any given page or set of pages.
This is the last version and has a little fix for the beta:
http://www.xuups.com/defacer.zipI'm working on adding url rewriting to it based on XoModRewrite but it will take some more time.
We should think of adding preload or callback points in several files of XOOPS so we can avoid this kinds of hacks and easily extend core if a module needs (like defacer or protector).