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@raito If you want an analogy with pipes, program A invoking popen("B",...) would be a very primitive form of the sort of coupling I'm talking about, but largely unobjectionable if B is just processing data and not controlling some persistent state.

The user invoking A|B is not a form this type of coupling.

But none of this is an argument about doing things with pipes. It's about whether programs are aware of each other & addressing each other with IPC/RPC.