MAC address = Media Access Control address
Believe I saw that this was possible somewhere, but now that I'm looking for it I can't find the implementation.
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I really think this would be a security issue if you can see it with JS or Flash. Actually, neither JS or Flash shouldn't offer access to any details of the user's PC except some very basic data about the OS, browser, screen resolution and such, things that you would actually need quite often. Who knows, might be possible with IE6 :D