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How does a "supercookie" differ from a standard cookie?
Supercookies, the new techniques, which are legal, reach beyond the traditional "cookie," a small file that websites routinely install on users' computers to help track their activities online. Hulu and MSN were installing files known as "supercookies," which are capable of re-creating users' profiles after people deleted regular cookies, according to researchers at Stanford University and University of California at Berkeley.
Read more: Latest in Web Tracking: Stealthy 'Supercookies' - WSJ.com