A system for contacting an interested party utilizing a computer network is disclosed. A protocol converter may analyze a protocol of protocol data, and may sequentially output a plurality of sub-data of the input protocol data according to types of the plurality of sub-data and a plurality of phase information representing the types of the plurality of sub-data. Since the optical fiber and the enzyme are used in combination, the biosensor is highly sensitive and selective and can serve as an excellent odor sensor. Upon detection of double-talk status, operation of the echo canceller is suspended. Integral vent tubes are provided to allow air to escape from the container. Methods for controlling silverfish using such bait compositions are also provided.