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Demand PagingBring a <strong>page</strong> into memory only when it is needed Less I/O needed Less memory needed Faster response More usersPage is needed reference to it invalid reference abort not-in-memory bring to memoryLazy swapper – never swaps a <strong>page</strong> into memory unless <strong>page</strong> willbe needed Swapper that deals with <strong>page</strong>s is a <strong>page</strong>r