A power converter includes a transforming unit having pins outwardly projecting from the transforming unit, and a socket. According to one embodiment of the invention, authentication, authorization and accounting is performed for a subscriber desiring to connect to a plurality of services on different contexts. The etch solution is formulated to selectively etch a silicon layer relative to other layers on an integrated circuit. A haptic signal is generated based on the set of state signals to convey information regarding the lateral positional relationship of the vehicle with respect to the lane and the heading angle of the vehicle with respect to the lane.