The easiest way is to get www.mydomain.com/test serve an HTML file that has one frame with a simple IP address. However, this means that the URL in the (awesome) address bar always remains unchanged, even if you click on the link on the displayed page. (You can avoid this by adding target=_top in href , but this will require some changes for your "asp.net".)
The only other way I can think of is to make www.mydomain.com act like a proxy. That is, in /test it has a script or something that receives a page from your "asp.net" and redirects it to the client.
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