A computer-implemented method and apparatus for provisioning elective message tags within a smart display in the context of a ubiquitous computing operation. A flush-fitting tank cap 110 having features and advantages of the present invention is preferably characterized by a cylinder portion 30 adapted such that it may screw into a correspondingly threaded gasoline tank neck or bung 100. Also, in a terminal having a folding mechanism, predetermined processing is automatically executed in response to the open motion from the closed condition. The various disclosed embodiments maximize motion through careful alignment, size, location in the disc space, configuration of the articulating surfaces of the ADR, and adequate soft tissue release. An expected performance map may be constructed with the expected cumulative profit and lower profit limit plots.