The article explains characteristics of applications at this level , as well as what the program developer must , should , and can optionally do to achieve and exploit this level 本文解釋了這一級別應(yīng)用程序的特征,同時(shí)也總結(jié)了程序開發(fā)人員必須、應(yīng)該和可以做哪些工作來實(shí)現(xiàn)和利用這個(gè)級別。