CNAME Subdomain, how do I hide the URL?
 

Hello,

I currently Have Site abc.com and I made CNAME forum.abc.com point at 123.com which is where VB is currently up and running and hosted.

Now when someone clicks or types on the link forum.abc.com it will goto 123.com and show the 123.com in the URL address bar.

Is it possible to hide the URL in the address bar so that when someone either types forum.abc.com it will stay that way when they are navigating the page? I know it's been done but I can't seem to find the past threads.

Thanks in advance!