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* '''View System''' – An extensible set of views used to create application user interfaces.
* '''Package Manager''' – The system by which applications are able to find out information about other applications currently installed on the device.
* '''Telephony Manager''' – Provides information to the application about the telelphony telephony services available on the device such as status and subscriber information.
* '''Location Manager''' – Provides access to the location services allowing an application to receive updates about location changes.
