This may be answered elsewhere, but I couldn't find answers to these specific questions. I'm planning to get a MBP, but I want to make sure these things work as I think they will. 1. I plan to plug an external 22" monitor into the MBP, and I want to span the desktop across the laptop monitor and the 22". I assume that I can span with the external on top, and the laptop on the bottom? 2. Also, if I do this, where will the dock end up? Can I specify where I would like the dock to be when spanning, and then have it go back to the laptop when I switch back? 3. Does the MBP have independent settings for the external monitor, so that it automatically uses the right resolution, color settings, etc. for the second monitor whenever you switch it on? 4. Any other issues to be aware of with spanning?