you don't need .net technology to do this, but this would involve you having to buy that domain name and just having it point to the new site (redirection).

I wish I could tell you more specifically how this is done with windows, but almost any webhost can set this up for you on a windows based system (or linux), or you can see if windows supports mod_rewrite

more bad news .aspx is not a valid domain

Thanks for your reply but its not multiple domain names that I'm trying to use for a single site.

What I'm trying to do is replace a page name that has a querystring associated with it with a 'friendly' url without the querystring. For example I want the user to be able to type as the url http://mydomain.com/dewalt.aspx. This page will not actually exist as part of the mydomain.com website. In fact it doesn't exist at all. I need to associate this address with the following one: http://mydomain.com/results.aspz?page=dewalt BUT I want the user to see http://mydomain.com/dewalt.aspx in the address bar. I CAN'T just redirect dewalt.aspx to the results.aspx?page=dewalt address because that changes the url in the address bar.

Hopefully that is clearer.

oah ok, take a look at:
http://www.isapirewrite.com/

i don't think that IIS .net supports mod_rewrite