Personal Presentity Presence Subsystem

A personal presentity presence service provides support for heterogeneous presentities. Presentity types including personal presentities are registered with a presentity manifest store that includes information such as type names, addresses of applications associated with actions related to the presentity type, application parameters, icons for watcher application, and the like. Personal presentity service identifies the personal presentity types associated with the user and automatically organizes these into a personal presence group for management and presentation purposes. Users (watchers) can then register for different groups of personal presentities, which are devices and systems personally associated with the user, based on a type of presentity and receive updated presence information.