The high-order word indicates the distance the wheel is rotated, expressed in multiples or factors of WHEEL_DELTA, which is set to 120. A positive value indicates that the wheel was rotated to the right; a negative value indicates that the wheel was rotated to the left.
The low-order word indicates whether various virtual keys are down. This parameter can be one or more of the following values."
like you see theres another way ;)
but thanks for all