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I tried SockClient.prg and sockserv.prg

but I not understood how send a txt file from a computer to another not on the same Lan


Is there a small functional example how to send and receive a text file from one computer to another and vice versa?

You should have 2 codes, one is to create a SERVER to be waiting for a connection and another one to CONNECT to the server.

Here you have the example server ( running port 10000 ):
https://github.com/harbour/core/blob/ma ... /ipsvr.prg

then the next step, here is HOW to connect to the first one:
https://github.com/harbour/core/blob/ma ... ipclnt.prg


Note:
It require muitthread, so add to your build -mt