VirtualMemory - The process of using a persistent storage medium to simulate ramdom access memory.
When a pointer is dereferenced, a ResidencyCheck is done by either software, or in many cases hardware. If the address is not currently mapped to a region in random access memory, a SoftwareInterrupt or HardwareInterrupt results. The requested block of memory is then Swizzled into random acces memory, and the dereference continues without any knowlege by the accessor.