The invention allows a cluster tool to change from a first recipe to a second recipe, while preserving periodicity and ensuring that there are no delays at critical points. The self-opening cylinder has three combined piercing and cutting elements with the interior having three molded elements, evenly distributed and extending toward the center of the cylinder, which have a nail shank and a nail head. The first light source is disposed on the first side of the first light guide plate. Therefore, this channel is completely depleted by the program drain voltage. The system sends purchase orders to vendors for review and approval, and tracks goods received and manages invoices and payments. A gateway connects the home network with the Internet and, at the same time, forwards externally-supplied data to the home network.