| http://www.w3.org/ns/prov#value | - Still referring to FIG. 3, the optical pointing device further comprises at least one light source 410 (or more) such as a LED, which produces radiation, preferably monochromatic (such as visible or non-visible light???preferably infrared light), that impinges on a portion of a surface S. Surface S may be a planar or non-planar surface, such as a surface over which the pointing device is moved (as
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