Firstly I would like to introduce myself, my name is Wesley and I am new to MacRumors.com. I have come here many times through Google searches & figured it was about time I signed up. I look forward to being a part of the community! I have a couple questions: 1) I currently have Snow Leopard on my one computer and on another computer I just have Leopard. I am purchasing Mountain Lion from the App Store today and am going to install it onto my computer with Snow Leopard. Can I then take my old Snow Leopard disk and instal it onto my other computer? 2) When installing Mountain Lion onto my computer, will everything (Files, applications, games, etc) remain? Or does it wipe everything out? 3) I ultimately want Mountain Lion on both of my computers, does that mean I need to buy two copy's? Or can I down the same copy of Mountain Lion from the App Store on both computer and install? Thank you in advance, any help would be greatly appreciated!