A hydraulic unit for a slip control system of a hydraulic vehicle brake system comprises a hydraulic block including a socket, a first port, a pressure change damper, and a second port. In one embodiment, a water-sheeting coating 20 comprising silica is sputtered directly onto an exterior surface of the glass. The network device can include a high watermark for determining when to process transmit completion interrupts. The display object is then displayed on one of the touch panels at the determined location.