Mac OS is the computer operating system for Apple Computer's Macintosh line of personal computers and workstations. A popular feature of its latest version, Mac OS X, is a desktop interface with some 3-D appearance characteristics.
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CSG International. CSG International (CSGI) is a multinational corporation headquartered in Englewood, Colorado. It provides Business Support Systems (BSS) software and services, primarily to the telecommunications industry. CSG was founded by Neal Hansen as a division of First Data in 1982.