PDA message mechanics: sender code irrelevant?

[The Grim Sleeper]

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Yes. In order to send messages over wired network, the console has to be built over a data terminal.

Could you clarify on the Yes bit? I still don't really understand how the programs SigCatcher and SigSender work on stationary computers.

How can data terminals be constructed? The wiki points to the mechanic, but that lead me nowhere: the Device Analyzer doesn't work on the ones already in place, and I don't know where to find a recipe list or construction manual to build them from scratch.