Alright so I got a Samsung 22" monitor last week and I love it, but anyways, I've been using it as a dual monitor with my Macbook. I can drag stuff over and use the two screens, you know all this already. I can also use it with the MacBook closed and in mirror mode (which just displays the same image on both screens, right?) But my question is that I've seen people in the post your setups thread who have their MBPs hooked up to a monitor, but there background on their MBP is different from that of their monitor's. How do I do that? Thanks a lot!