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Message: <blockquote data-quote="freyar" data-source="post: 6547884" data-attributes="member: 40227">Not sure what you mean by "universes parallel to the 'live' universe," I'm afraid.  And it's very hard to say who has what client, since we don't have a (mathematical) definition of what that would really mean in quantum physics.  There may in fact be subtle experimental differences between the orthodox interpretation of quantum mechanics and the "many worlds" interpretation (I do know of some pretty reputable people working on the subject, though not many), but it's never that two observers would disagree at any point.  And there's no global "host computer" resolving things.  In many worlds quantum mechanics, everything happens through usual interactions --- normal quantum physics.Those two events have past-future ordering relative to me.  But because of that there is no way to change observers to reverse the ordering, according to the math.  It just can't be done.  So they have past-future ordering according to everyone. As Umbran says, relativity is a lot about how what different observers see is related.  An important point is about figuring out what every observer always agrees on!  But it's the shocking differences that tends to get a lot of the attention.</blockquote>