HIMEM.SYS - technical definition

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. In Windows 95/98, HIMEM.SYS was automatically loaded at startup. See XMS and DOS HIMEM.SYS.