Look into URL rewriting.  That's most likely how they're doing it.

http://weblogs.asp.net/scottgu/archive/2007/02/26/tip-trick-url-rewriting-with-asp-net.aspx



On Nov 17, 2:41 pm, BigJ <[EMAIL PROTECTED]> wrote:
> i'm trying to build a weblog app similar to xanga, and was wondering
> how does the site handle a url likehttp://www.xanga.com/jediwa72,
> where the username "jediwa72" is not a file name nor is it passed in
> as a URL parameter (?UserId=jediwa72).  On top of that, how does the
> site decide to show either the "main" or jediwa72's  page based on
> that?  You would think they would have to use the hide property, which
> would be totally inefficient, or redirect to another page, which they
> are not.  any insight?

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