A system and method are disclosed for providing controlled access via an external network to a resource residing on an internal network. A method for using a mixer and mixer assembly for treatment of fluids is also provided. The image receiving means and the image display means both contain mounting apparatuses which allows for each component of the system to be temporarily attached to the vehicle and to be removed after the intended use for the system has been completed. The distal washer member communicates with a first surface of the inner member and the proximate washer member communicates with a second surface of the inner member. The two-phase driving operation is employed to prevent discharge failures during write discharges.