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Please see the sample addon 'randplace' for a working example of using some of these features.
-The facebook addon provides an example of integrating both "addon" and "module" functionality.
Addons work by intercepting event hooks - which must be registered.
Modules work by intercepting specific page requests (by URL path).
'body'
'headers'
+###'nav_info'
+is called after the navigational menu is build in include/nav.php.
+$b is an array containing $nav from nav.php.
+
Complete list of hook callbacks
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