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HIMEM.SYS

An extended memory manager that has been included with DOS and Windows, starting with DOS 5 and Windows 3.0. It allows programs to cooperatively allocate extended memory in 286 and higher PCs. HIMEM.SYS is an XMS driver. Starting with Windows 95 and subsequent 32-bit versions of Windows, HIMEM.SYS was automatically loaded at startup. See XMS.



XMS

(1) See cross memory services.

(2) (eXtended Memory Specification) A programming interface that allowed DOS programs to use memory above 1MB in 286s and up. It provided functions to reserve, release and transfer data to and from extended memory and the high memory area (HMA). XMS allowed data and programs to be "stored" in, but not "run" in, extended memory. See extended memory, HMA, HIMEM.SYS, VCPI and DPMI.



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