Easwar Hariharan wrote:
I am curious to know, how do search engines get user details when a
person uses the search facility.  Normally only the IP address of the
computer is available and that too changes dynamically. So except for
city location of the computer, how do they know the user details?


Er,cookies??



Cookies will only tell if the same pc is back. It does not reveal user information. Firefox users can set cookies to 'Untill I close firefox' option. This keeps them alive for that session only.
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