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I want some function that it can send or recv message from other application by tcp or udp.
How to add the function?

There are functions for working with sockets.
Look at CreateInstall folder\cmds\libs\socket\socket.g

You can find the examples of the using in cmds\libs\http\http.g

If you want to include these files into your project then insert Source Code command with the checked External Source Code checkbox.

include {
$"$exepath$\cmds\libs\socket\socket.g"
}

After that, you can call those functions from other Source Code commands.