KEYC_TYPE_FUNCTION
(((key) & KEYC_MASK_TYPE) == KEYC_SHIFT_TYPE(KEYC_TYPE_FUNCTION))
(((key) & KEYC_MASK_TYPE) == KEYC_SHIFT_TYPE(KEYC_TYPE_FUNCTION) && \
KEYC_NONE = KEYC_SHIFT_TYPE(KEYC_TYPE_FUNCTION),