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  3  definitions  found 
  From  Jargon  File  (4.2.3,  23  NOV  2000)  [jargon]: 
  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. 
  From  The  Free  On-line  Dictionary  of  Computing  (13  Mar  01)  [foldoc]: 
  {Compatible  Timesharing  System} 
  From  V.E.R.A.  --  Virtual  Entity  of  Relevant  Acronyms  13  March  2001  [vera]: 
  Compatible  /  Cray  Time  Sharing  System  (Unix,  predecessor,  OS)