The dell is a 2005FPW. 1680 x 1050
The reason I have it set up like that is when I get involved in work, school, or internet browsing, my screen collects windows. I like to watch movies or TV as background noise, so I throw it up there so that it does not get in the way. When I don't want to use it, I can fold it back behind the TV.
If I clone, then it is useless to have a 2nd display, and I will still have to manually turn off the screen.