Hello, first newbe post here. Just bought my Dad a new iMac (Mountain Lion 10.8) I am using MBP 17" Leopard 10.5.8 We are not in the same building or on a mutual network except for the internet. I want to share (control) his screen so that I may help teach him how to use the Mac. He has never used one before. I am familiar with screen sharing in ichat in 10.5, and I haven't used or seen Mountain Lion 10.8 until I set up his machine. How can I screen share with him so that I can control his screen from my Mac. I hope this is possible between the two different OS versions. Thanks!