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By user app you probably mean client. And by multiple nodes you probably mean resources... that are on server-side. I don't know what do you mean by communication module. Well, it's just the communication protocol, and you will certainly not start from scratch but use a library for that (btw, in which language ?). Before speaking about data and ...


The first and foremost issue stability. Port 25 is SMTP. Port 70 is gopher. Port 80 is http. And so on. These are established, known and assigned numbers. They have meaning between systems that are dissimilar. The port number needs to be stable. You can't always run the mail process as process 25. You've got no guarantee about what order it launches in and ...

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