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Multics
Multics was a mainframe time-sharing operating system begun in 1965 and used until 2000. It was a major influence on subsequent computer operating systems.
Contributions are invited: if you have a correction, fact, date, name, anecdote, or picture, please share it with Multicians everywhere by sending mail to the editor. Their hardware simulator booted Multics MR 12.5 software, came to operator command level, entered admin mode, created a small PL/I program, compiled and executed it, and shut down. Multicians still miss the elegant, consistent, and powerful programming environment; some Multics features are only now being added to contemporary systems.
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