An Electronically-Controlled Register vent that can be easily installed by a homeowner or general handyman is disclosed. Multiple authentication rules can exist in the computer network. The light guide plate includes a first and a second prism structure for scattering the light emitting out of the light guide plate. In another broad respect, this invention is a process for removing paint, comprising: applying a composition containing dialkyl carbonate, hydrogen peroxide, and water to a painted surface for a time and under conditions effective to cause blistering or bubbling of the paint. Finally, the method repeats the selection of a feature point using another working layer of the first image and another working layer of the second image, each of these working layers has a larger pixel array size and a higher image resolution than the initial working layers.