Forgive my ignorance. I'm used to playing with 5 people sat around a table all working towards the same ends (more or less). How do the games that have huge numbers of open slots actually work? I've tried to find info online, but short of joining one I can't find anything. If you connect to the game and there's some 40+ people playing, practically, what happens? There must be some order to the potential chaos of having characters spread all over the in game world, doing different things.