A method of invoking a set of services corresponding to a plug-in application installed on an image handling device. The method including launching a host application of the image handling device, accessing a configuration file of the image handling device, the configuration file including an identification of at least one plug-in and a corresponding set of services, launching the identified at least one plug-in, the plug-in providing the corresponding set of service in an integral fashion to the host application and presenting a unified graphical interface including host application services and the corresponding set of service of the plug-in.