Abstract: A piston may be provided which includes a first piston body portion having an end wall extending radially about a central axis along which the piston reciprocates. The piston may also include a second piston body portion having an end wall extending radially about a central axis along which the piston reciprocates. The first piston body portion and the second piston body portion are axially opposed. The piston may further include a first piston rod bore disposed in the first piston body portion extending along the central axis and a second piston rod bore disposed in the second piston body portion extending along the central axis. The piston may also include a circumferential opening disposed between the mating of the first piston body portion with the second piston body portion.

Abstract: A computer system for controlling the operation of a multifunction device, including a central processing unit, a memory device connected to the central processing unit, a plurality of device drivers, wherein each of the plurality of device drivers issues commands to control the multifunction device and an arbitration mechanism connected to the plurality of device drivers and further connected to the multifunction device, wherein commands issued by the plurality of device drivers are received by the arbitration mechanism, and wherein the arbitration mechanism determines a sequence for the commands to be issued to the multifunction device.