A program replacing method includes registering a first program so that message transmission is enabled between the first program and a detachable point of deployment. In one embodiment the giant magnetoresistive effect under the leads is destroyed by removing the antiferromagnetic and pinned layers above the free layer. The present invention provides a composition algorithm, together with an interference criterion and its correctness proof, which guarantees that behavior of the original hierarchies is preserved for interference-free compositions. For aptitude testing of the relevant object the computer evaluates the aptitude data thereof and the actual application data. The electrical end of the fixture base includes electrical connectors that mate with corresponding electrical connectors of the lighting sticks.