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I want to get information about the IP address of computer…What does they do???
Its basically a “name-tag” to identify your computer/network and its location in the world, so the required data can be sent and received.
The admin’s of Orkut and Facebook can and does know if two id’s are logged in from same IP, but you as a user can’t. Every webmaster/admin of the site you visit can know, among other stuff, your IP, your OS, your Browser version, your screen resolution, your country (by resolving IP) and the time you viewed their particular page.