A handheld computing unit includes a processing module, a main memory interface for coupling to a main memory, a baseband processing module, an RF section, a block IO interface for coupling to a hard disk, a handheld bus structure, and a handheld connection structure. The assembly includes a trailer having a center rail with a two-point trailer hitch at the front end and a pivotable single wheel at the rear end. Novel processes for preparing 6,7-unsaturated-7-carbamoyl morphinan derivatives are also provided by the present invention. While in this chamber the kinetic energy is greatly increased as is the temperature of the exhaust gases causing a break down of polluting molecules. The imaging lens has a quality image stabilizing system in which a light-weight lens piece is moved in directions perpendicular to the optical axis.