Using ultrasonic technology, Elliptic brings touch-free gesturing to Microsoft's Windows 8 operating system.Forget about greasy fingerprints smudging the screen of Microsoft's touch-based Windows 8 devices. Elliptic Labs announced the Nov. 13 launch of touchless gesturing that uses ultrasonic technology to let users scroll, select application commands and perform other functions in the operating system by moving their hands in front of the display. While it may seem like something out of a science-fiction movie, the technology has already been incorporated in the Windows 8 Gesture Suite.The Windows 8 Gesture Suite enables a touchless version