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The Digital Vision Touch (DViT) system uses smart cameras to determine where a person touches a large display, thereby allowing intuitive human-computer interaction. The cameras process the collected images in such a way as to recognize various object attributes, such as location relative to the display in 3D space. The system can then use this information in feedback to the computer generating the display, enabling touch control of the application. When we touch-enable large displays, multiuser collaboration and the ability to detect pen or finger contact are desirable functions. DViT is a touch-enabling technology with this capability and facilitates human-computer interaction in a natural way. The system we created works with a variety of display sizes - both large and wall-sized formats - and accommodates multiple users simultaneously.