A transparent screen includes a refractiontotal reflection plate in a form of a Fresnel lens, the refractiontotal reflection plate having a sawtooth surface upon which light is incident and another surface via which the light exits, and an image formationdisplay plate for forming a projection image from the light that exits from the refractiontotal reflection plate. In another aspect, the invention provides a process for forming hydrogen storage material. The second mating connector has a second interface. The client may strike a basket or wave or individual stock by entering strike information into a client database residing on a client computer.