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He also co-developed the Blit graphical terminal for Unix; before that he wrote the first window system for Unix in 1981. Pike is the sole inventor named in AT&T's US patent 4,555,775 or "backing storepatent" that is part of the X graphic system protocol and one of the first software patents.
Over the years Pike has written many text editors; sam and acme are the most well known and are still in active use and development.