Managers ^[3] provide tools for the core code to extend itself at specific points, and in many cases are the objects used directly in the code to implement core features. In other cases they simply provide the hooks with an entry point into Evolution. For example, for the main menu hook, the manager is a thin layer to BonoboUI. On the other hand, EPopup is a complete implementation of a popup menu management system which was already used in Evolution 2.0. Some managers are one-off objects used as constructors for other objects, others are view-dependent, and some are static objects, such as the Event routers.