1. A method of organising a computer's memoery so the operating system can allocate portions of the memory without restriction. The opposite of a flat addres space is the segmented memoey architecture of MS-DOS and Microsoft Windows 3.1, which divide memory into 64K sections (called segments). A falt memory space design is more efficient because the processor does not have to map each momery address to a spsecific 64K segment, but such a design requires the use of 32-bit memoery addresses. Microsoft Windows 95, which emplys 32-bit memory addressesm creates a flat address space for your applications. From QUECID