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You can't see MAC addresses over the Internet. And people can change them anyway. You can use a cookie but that only works if your target is too dumb to erase it.
You can also try a "Flash cookie" or something similar.
These also only work if you are talking about HTTP.
Basically, if a user drops cookies and can change IPs, you can't stop them.
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2010 Nov 19 at 03:30 UTC
— Ed. 2010 Nov 19 at 03:31 UTC
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