DOS/4GW

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DOS/4GW is the most widely used 32-bit DOS extender, designed to allow DOS programs to eliminate the inherent DOS 640KB memory limit by addressing all the extended memory on Intel 80386 and above machines in MS-DOS, PC-DOS, DR-DOS, the DOS boxes of OS/2, Windows, Windows NT and Windows 95 and other DOS clones, and even DOS emulators like DOSBox. It was developed by Tenberry Software as a subset of DOS/4G and was distributed with the Watcom C compiler.

Functioning as a highly flexible and reuseable memory extension library it allowed programmers to easily access extended memory without programming specialized code. It was made widely popular by computer games like Doom.

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16-bit to 32-bit extension hardware and software:
DOS/4GW | PMODE | Super FX | Sega 32X | Win32s