Ok i will soon be wanting a user profile so that people can look at different users profiles, i was wondering how they work?

Take mine for as an example:
http://www.programmerstalk.net/member.php?u=4

How do you make it so that number at the end is there to identify the user, is it anything to do with the urlencode? and how does my page know that the user to show is user 4? (in my case).

Just a little confused on this,
Thanks
Lee

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