See the setting up a LAN world tutorial for more information.
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Opening a world to LAN provides a server that is accessible only to other people on the local network unless port forwarding is set up on the router.
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See the Minecraft multiplayer server tutorial and Mojang Studios' Minecraft multiplayer server download page for help.
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Many special types of servers rely on the use of map editors or the Creative game mode to build custom maps and the CraftBukkit server software to provide additional features. No two servers are the same, and frequently the line between archetypes is blurred or indistinguishable. Multiple archetypes of Minecraft servers exist, distinguished by the unique gameplay features, rules, and societal structures that they implement.