That depends on whether it's a bukkit or hamachi. If its hamachi just op yourself on the window where it says loading spawn area because basically op is admin on hamachi so if you are op you basically own a hamachi server.
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Check the Minecraft Wiki. It has information there.
No but they can make you an op. Would you like to join my server? If you do visit these websites minecraft-cliffside-server.webs.com, cliffside-forums.webs.com
You can't. Servers are run on a computer with a special program. You can make your own server though!
make sure that your hamachi server is on and that you gave him the right ip
Why would you make a minecraft server to play on it urself? It wastes RAM and time.