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CTSS /C-T-S-S/ n.
Compatible Time-Sharing System. An early (1963) experiment in the design of interactive time-sharing operating systems, ancestral to Multics, Unix, and ITS. The name ITS (Incompatible Time-sharing System) was a hack on CTSS, meant both as a joke and to express some basic differences in philosophy about the way I/O services should be presented to user programs.
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