This invention relates to novel pyrazolylpyrimidines of the formulain which R1, R2, X, n, Y, Z and R have the meanings given in the disclosure, to a plurality of processes for preparing these substances, and to their use for controlling pests. In one embodiment, a portable computer system includes a bus bridge and a bus coupled to the bus bridge. Source and drain diffusion layers are formed in self-alignment with control gates. A viewing system displays a captured image of the device, including one or more features interior to the protective surface, overlayed with the exterior image for simultaneous viewing of both images so that a position of a first feature present in the captured image can be viewed in relation to a position of a second feature in the exterior image.