Are these widescreen one meant to multipliable screen computers? Because I don't know of any widescreen monitors that have the large of a res.
Yes, usually double wide-screen setups.
Well my desktop uses three monitors, so how would I set it up to use a widescreen yet keep the ability of the multi monitor?
If your desktop does not have the ability to span the wallpaper, you can cut it in three parts and set it in each screen.