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Industry standard operating system (OS) developed as a joint venture between University of California at Berkeley and the AT&T Bell Laboratories. A multi-user multitasking OS operates on a wide variety of computer systems from micro to mainframe. Written in C, it carries with it C's inherent transportability that enables it to be easily ported to many different hardware platforms. In addition to their own proprietary operating system, many hardware venders offer UNIX as an auxiliary OS further expediting the free flow of data between multiple hardware platforms.