You can host the java version of the server on any machine. You can also just expose any client's game instance to your local LAN - that's all I do when playin

You can host the java version of the server on any machine. You can also just expose any client's game instance to your local LAN - that's all I do when playing with my grandkids. There are ways of doing multiplayer on your local LAN with a single account as well by simply editing your name in a single config file per machine. Google is your friend there. :)