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There's several ways to keep them seperated from each other. I'm not sure what all your set up looks like, but if you're running Linux just keeping them as unprivileged users should be pretty effective at keeping them from tredding on each other's toes. As far as your server set up goes, I'm not familiar with Spigot servers, but if RaspberryJuice isn't too memory intensive you can have several versions running, listening on different ports, that way they can even send and see their stuff without having to wait in line.