A group licensing scheme for validating groups of virtual objects within a distributed virtual world is provided. The heat dissipation device has at least one L-shaped heat pipe, a plurality of heat fins, and a heat sink base. The method further includes the step of abutting a punch of the injection mold on the bearing assembly to coaxially align and axially clamp the bearing assembly. A collector of the IGBT is connected to an electrode through a metal plate. Files are moved from a top level space of the active system into a temporary directory after stopping the processes, and files from the re-imaging directory are moved into the top level space. The prosthesis comprises a helical body having a plurality of turns, wherein the proximal and distal edges of the turns of the prosthesis has a pattern that interdigitates when the prosthesis assumes the deployed configuration.