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MyFaces core provides some "points of integration" that can be used by application and web servers to override or add some specific code. For example, JBoss AS provides a custom virtual file system (VFS), and MyFaces core needs to scan for faces-config.xml files, so it is necessary to provide some code that uses JBoss VFS to locate faces-config.xml files to be parsed later.
For more detailed information, take a look at the javadoc of each class on myfaces site.