actually the above poster is not quite correct.
On the site http://phpfaq.info a similar scheme is in place to what I think you may be asking for.
Any requests for pages such as http://phpfaq.info/local/nn (where nn is anything, but for this site a number) will be directed to a script which dynamically creates the page, there is no actual page for any of the links.
This is achieved in apache via the location directive where you can the webserver that for requests fitting a certain format a specific script should be used instead.