Returns the IP address of the computer which is running the application.
Please note that this function should be called after the user computer is
connected to the Internet.
When using a dial-up connection (telephone modem) then the IP number will change
on each connection.
Q: Why do I need this function ?
A: In case that the user computer is hosting the game then all the other player
should have his IP number so they can connect to the host.
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