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I would like to know if it is possible to get a computer's audiocard details and/or if the headphone jack is plugged in while he is visiting a website. Is this possible? How could this be achieved? Is this allowed/prohibited?

I know google analytics gathers all kind of data (Browser type, Country of origin etc). But is it possible to get hardware data?

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What operating system ? –  Paul R May 19 '10 at 13:20
Well, it would be great to have code that works for any OS. But if you could give an example of any OS you feel comfortable with I would be very happy. Thanks! –  MacPython May 19 '10 at 15:01
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