1. An apparatus to control a display, the apparatus comprising: a housing; first and second sensors each being supported by the housing and having an output, the first and second sensors including a field of view to encompass at least a portion of each of a plurality of persons; a digital color camera supported by the housing and adapted to obtain images of the plurality of persons in the field of view; and a computer within the housing and coupled to each sensor output to determine three-dimensional movement or location information concerning each of the plurality of persons, wherein the computer includes an output to a processor to control the display based on the determined three-dimensional movement or location information.