computer software for use in vision based human-machine interfaces, computer vision systems, digital signal processing, interactive multi-media, film and computer game animation, digital puppeteering and online multi-media; computer hardware; apparatus for reproduction and tracking of [ sound and ] images, namely, computer image display equipment, video image display equipment, [ speakers, amplifiers, audio-cassettes and video-cassettes; cameras, namely monochromatic and color video cameras, digital cameras and electronic cameras; ] headpose and gaze direction tracking apparatus, namely, [ cameras, ] computer hardware, [ computer cables, electrical cables, non-electric cables, fiber optic cables, power cables ] and computer software for headpose and gaze direction tracking