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The Webcam Social Shopper is one example of software that utilizes the webcam in this manner.
Free Track is a free webcam motion-tracking application for Microsoft Windows that can track a special head-mounted model in up to six degrees of freedom and output data to mouse, keyboard, joystick and Free Track-supported games.
The term "webcam" (a clipped compound) may also be used in its original sense of a video camera connected to the Web continuously for an indefinite time, rather than for a particular session, generally supplying a view for anyone who visits its web page over the Internet.
Some of them, for example, those used as online traffic cameras, are expensive, rugged professional video cameras.
For a more complete list see Comparison of webcam software.
Special software can use the video stream from a webcam to assist or enhance a user's control of applications and games.