Software development; Computer technology development, technical services; Software services; Information technology consulting services; Information system integration service; Monitoring system engineering installation service; Intelligent installation engineering services; Smart card System Engineering Services; Computer network system engineering service; Wholesale trade of commodities (except commodities subject to approval); Retail trade of commodities (except commodities subject to approval); Computer and communication equipment rental; Office equipment rental service; Audio and video equipment rental; Computer and auxiliary equipment repair; Communication equipment repair; Other office equipment maintenance; Computer wholesale; Computer parts wholesale; Software wholesale; Office equipment supplies wholesale; Wholesale of communication equipment and supporting equipment; Wholesale of communication terminal equipment; Office equipment wholesale; Electronic products wholesale; Wholesale of ticket machines, cash machines and spare parts; Computer retail; Computer parts retail; Software retail;