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Much of the current programming effort for conventional computers is spent in planning the allocation of primary and secondary memory during the execution of a program. Virtual memory systems were introduced in order to free the programmer from much of the time-consuming and routine work associated with memory management. However, when a program requires more memory locations than are available in a particular virtual memory, the virtual memory must be managed by using virtual access methods. For these applications, the virtual memory advantage of increased programmer productivity is sharply reduced.