A method for forming a composite structure. The filter behavior is \u201cintegrated\u201d in the sense that the overall design of the optical system results in the low pass filter characteristic, rather than having a separate, discrete component that implements the low pass filtering. The notification includes a called party telephone number. Together, the interface surfaces, sensing device and computer system are capable of effecting purchasing transactions over a network. The successful attempts, and their relative media positions, are correlated with the position of the transponder.