As a client connects to a peer in a distributed virtual environment, the peer provides the client with virtual objects that are relevant to the client so that the virtual objects can be rendered by the client and displayed to a user via a display device. Through synchronizing with turning angles, the system automatically controls the lighting system spotlight degrees, thus controls the illumination angles, and brings a wide range visual effect to drivers. The execution plan of the query is determined by an optimizer program. The shunt directs current to a meter relay, which is calibrated by establishing two set points, or desired trigger ranges, for the meter relay.