If users wave a NFC-equipped iPhone at a NFC Mac they need to be in close proximity to interact, the Mac will load all their applications, settings and data. It will be as though they are sitting at their own machine at home or work. When the user leaves, and the NFC-equipped iPhone is out of range, the host machine returns to its previous state

via iPhone 5 Will Enable Ambitious Remote Computing Program – Source [Exclusive] | Cult of Mac.