A clamshell heat exchanger panel has a pocket formed in an edge of a land portion of the panel so that a fastener can be inserted into the pocket, with its axis in the plane of the heat exchanger panel. For example, a technique for processing transactional data for use in accordance with a decision support operation comprises the following stepsoperations. A light source which generates an illumination stripe in general linear alignment with the lens axis across a depth of the field of view is provided. The node is then registered with one or more utility networks, receiving a unique address for each network registration.