A method and apparatus for protecting computer systems from a virus are disclosed. The circuit board mount has a base that is mounted to a circuit board. The SIP INVITE message represents a call request for a multi-media service. The plating apparatus and frame assembly are characterized by a series of spacers mounted along the removable bars for separating adjacent revolutions of the interconnected workpieces such that the workpieces can be effectively coated with the material. A first RF channel in the cluster is assigned the technology for which the majority of the base stations in the cluster have the highest total estimated demand. By a suitable choice of the number of light-conducting rods and the distribution pattern of the corresponding light outlet surfaces, both a uniform interior lighting and special lighting effects can be achieved.