Source: http://svn.oss.backendmedia.com/core.phps

All requests are routed through the core.php by one of the frontcontrollers ([http://svn.oss.backendmedia.com/www/index.phps index.php], [http://svn.oss.backendmedia.com/shell/shell.phps shell.php]).

This means that the core.php contains all the core logic to handle any request the WebBuilder2 can handle. Bootstrapping the configuration process by loading the [http://svn.oss.backendmedia.com/core.inis core.ini]. It also takes care of making instances of some core classes, such as the database interface, the debugger, session/auth/perm and the StageLoader (which handles the actual modules) and finally the OutputWriter (which handles the writing of the final output).