A charge pump circuit is configured for suitably controlling the charging current in the charge pump capacitors. An interface board is mounted to the first drawer so as to couple to a first electrical component when the first electrical component is located in the first drawer. Partial occlusion of a vessel can be accomplished by a device comprising an elongate catheter, a distally mounted expandable occluder, a variable flow mechanism, and a manometer. The system sends a request to the targets, receives responses from the targets, and determines a status of the targets based on the received responses or a lack of responses from the targets. In a comment display area, a message from a sever is displayed.