The background of course is mirrored I guess one would say, IT's the same image as on my other two. However, I can easily run a different program on each window with no problems. For example, I was running three different instances of WoW one on each monitor, with no problems at all. (I must add, I ran them at 800x600) I can probably go higher with no difficulty, but It was for a test.
On my main, I have the start bar, and the Desktop icons, to the left (the small monitor with new card) a single pic, to the right, a 19 widescreen. (My main is a 22" widescreen, the left one an old CRT 17")
Stephen