I have an iMac 27" and a Samsung TV/Monitor combo. I want to use the Samsung as the extended screen and the iMac as the primary screen (with dock and other desktop icons). The problem is that I can't find a way to have the mouse cursor go from right to left onto the Samsung. It acts as though it is on the right and I want the extended screen on my left. Can it be done? If yes, how? Thanks for your trouble.