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Persistent object systems greatly simplify programming tasks since they hide the traditional distinction between short-term and long-term storage from the applications programmer. As a result, the programmer can operate at a level of abstraction in which short-term and long-term data are treated uniformly. It is important that such a persistent system be capable of being used concurrently; such concurrent usage may arise because of parallel process facilities in the programming languagedblp:journals/csys/VaughanBDMB92 fatcat:vm24kkwnlfgznbboentibm3q74