>However, rather than checking for two keys simultaneously, you might
>consider using different keys. The 7,9,1, and 3 keys on the keypad might be
>more intuitive for the motion you're wanting.
Arrow keys are nice to use, even in combination for diagonal. If you
use the numeric keypad keys you are assuming that the person has a
numeric keypad, and that they don't have the Num Lock set to the
wrong position.
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