Is this possible? I'd like to achieve this hopefully with cables rather than a LAN connection. I can get either thunderbolt cable or usb cable but before buying anything, I want to make sure if this is possible at all? My hunch is that it won't work even if I just hook up my MBA (Lion) to my iMac (Mountain Lion) with a thunderbolt cable. Do I need some app for this? If so what would it be?