| http://www.w3.org/ns/prov#value | - Other devices, such as a PDA, a pager, a radio, a MP3 player etc., could also contain the acoustic sensors 905.In each of the systems 900A, 900B and 900C, the user points at an object in a physical environment, and makes a snapping sound with his fingers or a snapping sound producing device to point to an object to be selected.
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