I tried searching and googling and didn't find anything about this. Suppose I bought a Mac App Store App on one Apple ID, and another on a different ID, how does the new software update in Mountain Lion handle this? Is it like with iTunes, where you have to manually sign-out and into each Apple ID to run the updates? Does it do it all automatically regardless of the ID you are signed into, like on iOS? Or does it perhaps transfers the registration to a single Apple ID, like when you buy a new Mac and it assigns the iLife Apps to your Apple ID?