whb allows 2 simultaneous keys pressed, it returns the first pressed in [2] and the second in [3] this allows to have alternate key functionality with fn key...
Also, have you come up with a way to identify button releases? I see the release events happen, but it doesn't appear to identify which button was released.
If you want to know which button was released you should first save the state of pressed buttons and compare it with the state in the next iteration of while(1)
