For what it's worth this "address masking" question always bugs me. Because
it's been my experience that most web site visitors aren't paying a bit of
attention to the address bar when they are browsing a site(s). So why
over-think it.
Anyway, what you are asking about is "framing". With frames you mask the
actual destination. Publisher has no support for frames. A discussion of
frames ( which are avoided by most 'professionals' ) is off topic for this
forum. I'd refer you to any good HTML resource for a frames overview. If you
need a suggestion try www.htmlgoodies.com

David Bartosik - [MSFT MVP]
www.publishermvps.com
www.davidbartosik.com