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IBM PC DOS
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== PC DOS as a distributed file client == In 1986, IBM announced PC DOS support for client access to the file services defined by [[Distributed Data Management Architecture]] (DDM). This enabled programs on PCs to create, manage, and access [[record-oriented file (DDM)|record-oriented file]]s available on IBM System/36, IBM System/38 and IBM mainframe computers running [[CICS]]. In 1988, client support for [[stream-oriented file (DDM)|stream-oriented file]]s and [[hierarchical directory (DDM)|hierarchical directories]] was added to PC DOS when they became available on the DDM server systems.
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