The present invention provides for an assembly for locking a first workpiece mountable onto a second workpiece. The local oscillator signal from the local oscillator is transmitted from the microwave antenna array to illuminate the local coils. The material is retained against the belt by vacuum. Nitride-based power semiconductor devices are described including such an electrode structure, which can reduce leakage current and otherwise improve performance. The second and third support portions are symmetrically located on both sides of a straight line that extends through the first support portion and the axis of the substrate. The method includes coupling to a baseboard management controller of a computer system via a console port, maintaining a persistent connection to the baseboard management controller, monitoring data from the console port, determining from the data whether an unauthorized access has occurred, and sending an alert if the unauthorized access has occurred.