The present invention provides a communication system for performing the seamless handover of a mobile station between at least a first wireless access point and a second wireless access point within wireless LAN. Each clamping member carries at least one applicator shoe conformed to press the abrasive belt against the bearing surface along a surface essentially limited to a generatrix parallel to the axis of the bearing surface. With low cost coal fuel, burned in the gas turbine engine burner, a large portion of the fuel energy is efficiently utilized for home heating and electric power generation. The query representation is used to access the information resource. The backlight module using the optical plate can have a thin body with a good optical performance.