A live ref is an eventual ref into another vat — a reference to a remote object. Live refs last only as long as the two vats are running and in communication; they become broken refs afterward.
All live refs arrive either by being passed over another live ref (argument or return) or as the result of dereferencing a SturdyRef.
References to remote objects are either live refs, SturdyRefs, or not part of Pluribus.
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