private function _get_Win32_ComputerSystem()
    {
        if ($this->_Win32_ComputerSystem === null) $this->_Win32_ComputerSystem = CommonFunctions::getWMI($this->_wmi, 'Win32_ComputerSystem', array('Name', 'Manufacturer', 'Model'));
        return $this->_Win32_ComputerSystem;
    }