Can Shock sensors be used effectively on new style UPVC D/G windows, I have only used the on wooden frames in my limited experience. Im looking to use the VIPER
http://www.securitywarehouse.co.uk/catalog/index.php?main_page=product_info&products_id=541
http://www.securitywarehouse.co.uk/catalog/index.php?main_page=product_info&products_id=541