I currently have OS X ML. I recently purchased a 10 ft hdmi, thinking I could connect it to a TV, have something playing (background noise) and still continue to work on my MBP. Haven't used Windows for a while and I thought this was possible and I thought we were able to do this with SL also, after I switched to Lion I can't seem to figure this out. Is this not possible ? Do we need Apple TV for this ?