A technique dynamically triggers an exchange of reachability information between a tail-end domain target node of a traffic engineering label switched path and a local domain head-end node of the TE-LSP in a computer network. A controller holds individual speed data each defining a speed at which each of the driving units reciprocates the applicator along each of the different axes, and to control the driving units to reciprocate the applicator in accordance with the associated speed data. A solution to the formulation according to the method is unique if the gamut of the target device is known. A top surface of the cover body includes a top opening and an upper flap affixed to the cover body covering the top opening. The technique may be practiced as a computer implemented set of instructions, and may be incorporated into measurement equipment. The output of the sensor is indicative of a level of the tension.