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For example, the position of a single light source can be tracked and used to emulate a mouse pointer, a head-mounted light would enable hands-free computing and would greatly improve computer accessibility.This can be applied to games, providing additional control, improved interactivity and immersiveness.

Special software can use the video stream from a webcam to assist or enhance a user's control of applications and games.

Video features, including faces, shapes, models and colors can be observed and tracked to produce a corresponding form of control.

When "captured" by the computer, the video stream may be saved, viewed or sent on to other networks via systems such as the internet, and emailed as an attachment.

When sent to a remote location, the video stream may be saved, viewed or on sent there.

In December 2011, Russia announced that 290,000 Webcams would be installed in 90,000 polling stations to monitor the Russian presidential election, 2012.

Webcams can be used to take video clips and still pictures.

Some of them, for example, those used as online traffic cameras, are expensive, rugged professional video cameras.

making them the lowest-cost form of videotelephony.

Video calling support has also been added to several popular instant messaging programs. Software is available to allow PC-connected cameras to watch for movement and sound, a computer e-mailed images of the burglar during the theft of the computer, enabling the owner to give police a clear picture of the burglar's face even after the computer had been stolen.

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