Очень даже написано.
http://typo3.org/documentation/docum....3.0/view/2/2/
Цитата:
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Сообщение от tsref
Depending on implementation the class or function name (but not the method name) should probably be prefixed with ”user_”. This can be changed in the TYPO3_CONF_VARS config though. Also the function / method is normally called with 2 parameters, typ. $conf (TS config) and $content (some content to be processed and returned)
Also if you call a method in a class, it is checked (when using the USER/USER_INT objects) whether a class with the same name, but prefixed with ”ux_” is present and if so, this class is instantiated instead. See ”Inside TYPO3” document for more information on extending the classes in TYPO3!
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Написано еще в нескольких местах, но лень искать...