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I understand these get installed when installing Google Voice and Video Chat, but why are they there and what does Google use them for?

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They're also needed to use Hangouts in Google+. – Al Everett Oct 5 '11 at 23:52
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They get installed, so that Google Talk can talk to your Webcam & Microphone subsystems.

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But there're standard APIs for talking to webcams and microphones in all major operating systems so that applications don't have to install specialized drivers. Using a driver for this is quite weird. – billc.cn Sep 5 '11 at 0:47
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