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Ghosting Explained
If certain keys don't register when holding multiple keys down, your keyboard suffers from ghosting. High-end gaming keyboards have Anti-Ghosting (NKRO) guaranteeing all presses register.
How to test: Try pressing both Shift keys and typing a sentence. If some letters fail to type, your keyboard has an imperfect matrix. Try pressing W + A + Space. If space doesn't work, this can ruin gaming experiences!