A method for modifying a photomask layout includes the following steps. A power supply switch circuit connects a power supply circuit with a VBUS line based on transition of the state controller. Third-party advises customer of results, in real-time, and provides blind feedback to billing company by type error and utilization. The slides are independently from each other moveable against the rotor or away from it. The two way conversation can be externally observed by web-based users. The second base station exchanges the second communications with the service node.