A computer system and method uses script-based device drivers for operating hardware devices. The device includes a base that rotatably supports the beam and acts as a fulcrum point for the beam to rotate. The absorbent core is preferably covered with a porous skin typically made with fabric that has been printed with the colorful graphics. Each of the surgical devices seated in the instrument tray can have attached thereto a child RFID tag containing information andor facilitating access to information about the surgical device. Electrodes are connected to both end faces of the thermoelectric conversion element units. The invention also relates to methods for making the pre-impregnating agents.