Netcode - How to design

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For online games, yes, either you type in an IP address or the developer sets up a server. (ex. Blizzard set up battle.net)
For a small online game, try GNet. (I personally don't know much about it, except that it is hosted right here on blitzbasic.com)

But PLEASE!!! don't make the players have to type in IP addresses for LAN games.