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Unix
A computer operating system built by Bell Labs in 1969 as an interactive time-sharing system. Unix was the first standard operating system that anyone could improve or enhance and is used in workstation products from many companies.

Usenet
An Internet-based bulletin board system that contains tens of thousands of newsgroups that cover every imaginable topic.

Utility
Small software programs that handle discrete functions, such as measuring a computer's performance or directing files to the right printer.