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This thread is about how the user would like to tell the programmer how to "send messages between apps" despite not knowing a thing about it except there has to be a message broker that they can SEE in the process list and control if it starts up. If the user could be like "there are too many UNIX sockets here, how can I block them from opening?" they would do it.And this is exactly the problem. You came looking for a tool and you got handed a methodology. You just wanted to send simple messages between two apps, and you're going blind reading about security models and XML schemas. This in a nutshell is why things like Unix sockets win and things like Dbus lose.