Compatible XF Versions 1.0, 1.1, 1.2, 1.3, 1.4, 1.5 Disclaimer: This is a technical explaination and is geared towards developers. A working knowledge of PHP, OOP, and MVC is assumed. What is the XenForo Class Proxy System? In a nutshell, this system allows several add-ons to... You do not have permission to view the full content of this resource. Log in or register now.