A system comprises a memory storing a plurality of usage values. In accordance with the method, two semiconductor substrates having different crystal directions are bonded and selectively etched utilizing an etch selectivity due to the different crystal directions to form a probe tip region and a probe beam region. A primary user may designate which users can view specific items and should purchase specific items. The connection topology manager then builds a topology for the conference service based on the mixing capability, location, and minimum conference traffic delay, wherein the connection topology manager distributes a mixing computation in a substantially uniform manner across the plurality of telephony devices. Since the pilot valve is formed by a two-way solenoid valve, and the pressure passage is formed within a body, it is possible to reduce the number of component parts. 001-10 \u03bcm is cured into a cured rubber.