In an electronic filing system over a computer network, a central server sets the requirements for making submissions. Each of the lift arm assemblies include a main lift link with a rear end portion and a second lift link. In order to dependably determine whether motion is to be taken into account in a current frame, motion decisions of previous frames are taken into account. One pole of the fuel cell stack is electrically connected to the first case unit through an electrically conductive end plate, and the other pole of the fuel cell stack is electrically connected to the second case unit through an electrically conductive end plate. Composite output modules can include speakers, horns, and strobe lights, all without limitation, which can be independently driven and controlled from a common pair of lines.