This trick is used by a number of game mods, by way of providing a fake DirectX dll that monkeys with the internal game code and then calls the actual DirectX library.<p>ENBoost is probably the most prominent at the moment, and is considered nigh mandatory by modders for Skyrim, the Fallout series, etc, because it lets you override the game engine and use free RAM (beyond the game engine&#x27;s 2GB or 4GB limit) as an extended cache for your video card.