A method and apparatus for updating control data for a device driver that is stored on a first non-volatile memory. The moveable frame is moveably received in the stationary supporting frame and spaced from the stationary supporting frame. In some embodiments, marketing content may be incorporated into a challenge message for use in an identification test. In another embodiment, an HMM posterior approximation is used. In one case, this takes place by means of parallel switched SD modulators and a vector controller.