High Quality Content by WIKIPEDIA articles! 8 1/2 is a window system developed for the Plan 9 from Bell Labs operating system by Rob Pike. According to its documentation, the system has little graphical fanciness, a fixed user interface, and depends on a three-button mouse. Like much of the Plan 9 operating system, many operations work by reading and writing to special files. Because of the limitations stemming from its unusual implementation, 8 1/2 has been completely rewritten into its successor rio in recent Plan 9 versions.

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