A cursor control device having a light source and an image sensor for optically tracking motion. A balloon is operatively coupled to the distal end portion of the catheter shaft. The compartmentable equipment can comprise emergency access ports, including mating interface to a portable workpiece removal equipment to allow accessing the individual compartments without compromising the quality, defects and yield of the workpieces stored in the stocker. Relevant information on the trading desk may be brought together, and the information may be processed through a set of rules that extract trading opportunities.