So I have a Macbook and my parents have an iMac, each with seperate Apple IDs. If I purchase Lion using my Apple ID, is there anyway I can install it on my parents iMac without purchasing it a second time, either via the App Store or a Lion bootdisk made in diskutil? I am guessing I would log into the app store on their iMac with my ID and download it, but will they be promted for my Apple ID credentials for software updates, etc? Any help is greatly appreciated.