A method for continually controlling the collective behavior of a set of computing devices in a distributed data processing system. When the fuel level indicator is positioned under one edge of a full portable fuel tank, the platform pivots to a first position where the visual indicator indicates a full tank, and as fuel is withdrawn from the tank, the platform pivots toward a second position where the visual indicator indicates a less than full tank. Video content in the IM traffic is detected at the node. The image surface faces the through hole, and the pins are connected to the connecting pads.