The illustrative embodiment of the present invention provides a method of recording and using object associations determined by a location system at a tradeshow. The techniques may improve error detection in the partially reconfigurable IC. The mutant cholera holotoxin may contain at least one additional mutation in the A subunit at a position other than amino acid 29. The method includes a step for providing a semiconductor wafer. Alternatively, two latches engage the valve to retain the valve in a closed position. In the imaging apparatus, an operation on the dial member may be prevented by bringing the cover member into the closed state.