The original set of networking protocols for Apple computers, and also among the first implementations of file and printer sharing for personal computers. Computers and printers reside in "zones" and each has an unique AppleTalk address. The original implementation worked over propriety cabling, but now works over most types of network media and is available for Unix and Windows computers. The first set of TCP/IP protocols for Macs, called MacTCP, was based on AppleTalk.