rio is Plan 9 from Bell Labs's windowing system.
Many of its features embody key Plan 9 design concepts:
- Each window runs in its own private namespace.
- It exports a file system interface to running applications. This interface is the same rio receives from the operating system, so rio can run inside a rio window without any special arrangements. Because the interface uses 9P, rio is network transparent even if it doesn't include any network-aware code.
- Windows are treated as completely editable text.
It is most notably known for making its window management transparent to the application. This allows running rio inside rio of another window manager.
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