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Split off from #17510: * `HandleWantsOverlappedIo` can be used to check if a handle requires overlapped IO. This is important, as `ReadFile` and `WriteFile` are documented to not work correctly if an overlapped handle is used without overlapped IO and vice versa. In my tests with pipes, this appears to be true. * `CreatePipe` creates a synchronous, unidirectional pipe. * `CreateOverlappedPipe` does what it says on the tin, while allowing you to specify the direction of the pipe (in, out, duplex). * `GetOverlappedResultSameThread` is largely the same as `GetOverlappedResult`, but adds back a neat optimization from the time before Windows 7. I thought it was neat.