A device is presented including a host controller capable of attaching a quantity of queue heads to a frame list. The hydraulic coupling includes a transfer clutch, a clutch operator for engaging the transfer clutch, a fluid actuation system including a fluid pump for controlling movement of the clutch operator, and a magnetorheological pump clutch capable of selectively shifting the fluid pump between operative and inoperative states. A preferred embodiment of the invention stores a first page of the browser display in the cache. A shield layer connected to the negative electrode side of a power supply connected to the logic circuit formation region is disposed on the p\u2212 opening region. The printed wiring board provides a thermal path to the chassis.