New answers tagged side-scroller
You can't. At least, not as a game developer. As a gamer, you can purchase more expensive keyboards with "anti-ghosting" features, but otherwise the limitation is part of the hardware itself, so there's nothing you can do in software to solve it. Check out this demo page to see how keyboard ghosting works, plus a demo: ...
Buy a better keyboard. Ghosting is caused by the hardware itself. Even many gaming keyboards will still have this problem; they only invest in fixing the problem for "common" keys like WASD (but not 'K' for instance). http://www.microsoft.com/appliedsciences/antighostingexplained.mspx
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