| http://www.w3.org/ns/prov#value | - The portable personal computer as recited in claim 21 further comprising:a track ball assembly coupled to said base and including an elongated track extending across the front side of said base, a carriage with a rotatable sphere and being moveable along said track, and a means for producing electrical signals indicative of rotational movement of said sphere about two axes and indicative of moveme
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