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Himmel et al. Himmel et al. Britt, Jr. point. In this manner, various aspects of device functionality may be enabled or restricted (device “policies”). This policy enforcement capability is useful for a variety of reasons, including for example to disable noise and/or light emanating from Wireless devices (such as at a movie theater), for pre venting Wireless devices from communicating With other Wireless devices (such as in academic settings), and for forc ing certain electronic devices to enter “sleep mode” When entering a sensitive area.