DOS4GW = DOS 4GB extender for Watcom. It was a hugely popular DOS-extender that allowed 32 bit code and large segments on DOS. Actually, it was an crippled version of the full DOS4G (high-IRQ's were disabled). Thanks to that, soundcards with IRQ's over 7 never worked with DOOM. Anyways, this piece of shitty coding was distributed with Watcom C/C++ 10/11.

There's a freeware replacement called PMODE/W that actually works and is a lot smaller.

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