How to send a text file or binary data through internet using TCP/IP

Hi, I have to send a text file or simple binary data to a clone application in an another IP address. A simple server-client circuit and vice-versa.I'm using BC++ Builder 6.0 Which tools do i have to use? INDY ? or simple Ttcpserver/Ttcpclient components and how can I do that? Do I have to condider if I am behind a router or firewall?

Thank U
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