By "inner state", the parent didn't mean literally the RAM or disk storage used internally by the application, just the logical state that belongs to it. A Pla

By "inner state", the parent didn't mean literally the RAM or disk storage used internally by the application, just the logical state that belongs to it. A Plan 9 filesystem is just an interprocess communication API that happens to be structured in terms of virtual 'files' and file operations, kind of like what REST does with HTTP. The application handles all requests itself so it can always limit access or enforce invariants, which was absent in the Microsoft examples you linked.