DNS forwarding for website

I have two websites that point to the same ip.
AB.com >
ABC.com >

I have a third website (ABCD.com) that I want to point to ABC.com/newpage.html (to that specific HTML file).  so when people go to abcd.com, it will go automatically straight to ABC.com/newpage.html

How do I do this on a Windows 2003 web server? Do I need to create a new website or do it under DNS?
Anthony H.Asked:
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Point the domain to the same folder and set the default document to newpage.html.
Or do you want it to actually redirect to abc.com

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