Structure and methods for preserving lock requests by master devices on multiple buses each coupled to a port of a multiported device. The new method and bond coat is a major improvement over conventional bonding or coating methods. The projections on the frame may extend through the apertures of the cage when the insert is inserted into the cage. , to produce a reaction gas containing trichlorosilane, dichlorosilylene, hydrogen chloride and high-order silane compounds, and then the reaction gas discharged from the conversion furnace is cooled to 600\xb0 C.