A scan module in an electro-optical reader includes a first beam-folding mirror on a raised support wall at a rear of a support, and a second beam-folding mirror at a front of the support and operative for reflecting light through an opening in a frame wall to the first mirror for reflection therefrom above the frame wall between the front and rear of the support. The system and method incorporate a spacer, a cutting guide, and a template. The signals can be transmitted between the mobile computer and the foundation by using the first wireless network interface and the second wireless network interface. The first and second conductive metal strips are configured to conduct a current, which flows through the transparent conductive metal oxide film, causing the transparent conductive metal oxide film to heat the liquid crystal layer. Each substitute code segment has direct loads of the address information for calling the associated procedure instead of the original references to the linkage table.