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CTSS

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.