A blocking outlet and corresponding locking plug provide a completely enclosed safety electrical connection system for supplying electrical power from a wall fixture. Such techniques provide control, including moving, sizing, and orientating, of one or more displayed window frames in which one or more images are displayed. Sense lines used to sense voltage levels in the load are put through the same opening in the ferromagnetic E core as an output bus trace. The compiler saves two kinds of data during the first compilation: the maximum register-pressure occurring in each procedure; and within each procedure, the register pressure at each call site that is a potential inlining candidate. The sidearms and center-rear portion are movable between a closed position wherein the center-rear portion spans substantially between the opposing sidewalls of the dump body and encloses the open rear end of the dump body and an open position wherein the center-rear portion is positioned away from the open rear end of the dump body.