| http://www.w3.org/ns/prov#value | - As is shown in FIG. 1, handheld microprocessor unit 12 includes a display screen 28 and a plurality of switches or keys (30, 32, 34, 36, and 38 in FIG. 1) which are mounted on a housing 40 Located in the interior of housing 40 but not shown in FIG. 1 are a microprocessor, memory circuits, and circuitry that interfaces switches 30, 32, 34, 36 and 38 with the microprocessor.
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