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In this paper, we have discussed some of the salient aspects of virtual storage systems. Further, in the discussions of virtual machines and CP-67, we have illustrated an implementation of a virtual storage system as well as the generalization of the virtual storage concept to virtual machines. Although a virtual machine system does not within its strictly defined limits admit to the more complex uses of virtual storage, it does serve to illustrate the major problems confronted by many virtual storage systems. The utility of the virtual storage and machine concepts is wellestablished, and in the future, the application and extension of these concepts is certain to increase.
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