A system of cordless power tools includes a cordless power tool adapted to removably receive a rechargeable battery pack. The system and method automatically check security to protect a PC from computer hacking, viruses, worms, Trojan horses, etc. In the schema file, each component is defined by a unique class name. Form sections are disclosed for constructing a corner in a foundation footing form. A reset part returns positions of the controls to the positions acquired by the position acquisition part and memorizes a selection status of each parameter which indicates whether each parameter is selected or not, when the selection mode is completed.