| http://www.w3.org/ns/prov#value | - In another embodiment of the invention, the unit 10 includes a ???polling??? function that enables a user of the unit 10 to request location information from the other units 10A???10E. Particularly, the unit 10 includes a button or other input device coupled with the processor 22 that may be pressed or otherwise operated to cause the unit 10 to transmit a radio signal over the network requesting t
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