Windows and doors should be considered as a whole with the various related parts (profiles, hardware, tape, accessories, processing equipment, processing technology, technical support, software, production management, services ...) in order to achieve the established functions. To design an organic combination of the perfect performance of the system, we need to consider water tightness, air tightness, wind pressure, mechanical mechanical strength, heat insulation, sound insulation, anti-theft, sun, weather resistance, operating handle and other important functions. Also, we should consider the combined results of various aspects of performances, including equipments, profiles, accessories, glass, glue, seals. Only in this way can high-performance windows and doors are formed.