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I own a couple domains, one of which is hosted, the other I want to use as a domain mask.

if I'm using abc.com/Forum to host a forum can I have def.com/Forum to mask so that when pages open up the rest of the url changes according to the page ie. if abc.com/Forum/page1.php opens up then when I go to that page using the masked domain it will say def.com/Forum/page1.php ???

Right now I having the domain name mask def.com can only be set to go to the abc.com homepage and not set to go directly to any subfolders such as def.com/Forum to abc.com/Forum

How can I remedy this problem. Is it possible?