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I'm a Network Engineer.
Several commercial wireless products will let you triangulate a wireusers position to withing about 20 feet. Three different WAP's need to see the signal.
On the wired side, it pretty easy for anyone to track down a user to his ISP. The ISP shouldbe able to locate the user to a floor, if it's a campus environment, or to withing a small 10 or 20 block radius using the DEMARC/aggregation point the users DSL/cable comes in on.
IPv6 can embed the users MAC address in the IP address. (The adress is 128 bits long. The lower 64 bits can be something called a EUI-64 address, which is the users 48-bit MAC address with 'FFFE' inserted in to the middle.)
All of this is without resorting to any type of records, just putting the technology to use.
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From the day of his birth Gilgamesh was called by name.
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