A project from Microsoft Research shows how it is possible, using a simple webcam and some specially developed gesture recognition software, to control a computer using single and multiple gestures. Could be almost considered as similar to on-screen multitouch functionality, but the remoteness from the screen may prove a limiting factor.
This item is taken from the original Podtech MS Research video The Gestures of Microsoft Research, A Walking Tour which is worth watching (but is 50 minutes long).
http://www.podtech.net/home/1482/the-gestures-of-microsoft-research-a-walking-tour
Even earlier research, along similar lines, is described at the Theoretical Physics group from the University of Zaragoza in the following article A EyeToy/WebCam Mouse in Visual Basic
http://dftuz.unizar.es/~rivero/alumnos/vmouse.html
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