Microsoft Office Labs released its Touchless SDK for developers to experiment with multi-touch technology. With the SDK, developers can build multi-touch applications that use a color marker and webcam for input. Utilizing the webcam, applications can track the location and size of the color marker to enable multi-touch functionality without touching a surface, according to Microsoft.
The SDK can be used to build games or applications that could, for example, browse through media, said project developer Mike Wasserman. View the demonstration of the technology.