How to open TCP port in connection to ip-address?

How do i open a TCP port in connection to specific IP-adresses?
Is this done differently depending on the firewall?

A friend asked me to help him and i'm not sure of what firewall he has(he didn't know xD), but i'll post it when i find out.

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More about open port connection address
  1. Probably the firewall in the router. Normally you just would use *port forwarding* to allow a certain IP access to a certain port.
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Firewalls IP Address Connection TCP/IP Networking