The following code in the default document will hide the URL to where the request is being redirected:

htmltitleWelcome to a wonderful site/titleframeset cols="100%,*" border=0 frameborder=0 	border=0 framespacing=0 scrolling="no"frame src="http://source.domain.com"       name="AddressHidingFrame" marginwidth=0       marginheight=0 frameborder=0 noresize scrolling="yes"frame name="needed4Netscape2Work" marginwidth=0       marginheight=0 frameborder=0 noresize/frameset/html