Microsoft has talked for a while about the need for natural user interfaces to increase productivity and provide richer user experiences - speech and touch-based interactions being the most obvious examples. Touch-based technologies are becoming more pervasive - from the smart phone, tablet PC, Apple's multi-touch iPhone and our Surface/Touchwall technologies. Some require special input devices - the majority require only the touch of the finger(s) on the screen.
Recently Microsoft released the Touchless SDK to an open-source license. What's touchless? It's best to see this video for an introduction by the developers, put simply it enables you to build multi-"touch" applications that use a webcam for input… or as the team would say - it's touch without touching.
Source : Touchless SDK on CodePlex
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