The method is for using the Internet to facilitate a transaction between a customer and at least one supplier of music scores to discourage illegal copying of music scores. The system prevents both counter-rotation of the screw and axial backing out of the screw. The method also includes operating a second effector to maintain operation of the first effector within a first boundary limit, the second effector operation being initiated when the operating the first effector reaches a second boundary limit within the first boundary limit. In another embodiment, the tools may configure a data-packet switch according to a port description identifying a set of ports and a subset of the set of ports.