8½ (Plan 9)
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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.
- 8 1⁄2, the Plan 9 Window System by Rob Pike — The original paper.