browser fingerprinting - panopticlick EFF has an interesting tool available: https://panopticlick.eff.org/
technical details at https://www.eff.org/deeplinks/2010/0...ry-and-privacy
an interesting look at exactly how distinguishable your default browser configuration may be...
http://yro.slashdot.org/story/10/01/...r-IP-Addresses
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