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interactive graphical image presentation systems of the type including an optical image projector, a presentation screen for displaying graphical images to a viewing audience, a wireless optical pointer, an optical image scanner and a computer for selecting graphical images from a source and controlling the operation of the optical image projector, wherein image selection and optical projector control functions are accomplished by using the wireless optical pointer to project an encoded optical control image on the presentation screen, scanning the presentation screen, detecting the control image and decoding the control image for emulating conventional computer keyboard commands and/or pointing device (mouse, touch pad, track ball) position-dependent cursor operations (e;g;, select, move, left click, right click, double click, scroll up, scroll down)