A method and apparatus uses a stored three dimensional model of an object to render an image showing a condition sensed by a building control system. The device includes a transparent substrate, and a transparent fixed-position electrically conductive electrode with a bottom surface overlying the substrate. Next, a second value, which is for indicating an amount of data having the specific data value in a set of read data, is counted, wherein the set of read data is obtained by reading the set of written data. The unique number may be entered once into the second network device or may be received from the first network device through a data interface by the second network device.