Chapter s Operating System 5.1.2 User interface related functions These computational structures will be defined and described in later chapters; here we only point out a few salient features. It is assumed that each program is individually initiated by the user through the user interface. The single program consists of the execution of a program on a given set of data. The user initiates execution of the program through a command. Two kinds of programs can exist sequential and concurrent. A sequential program, which matches with the conventional notion of a program, is the simplest computational structure. 以上这些计算结构将在以后各章中定义和描述,此处只指出一些简单的特征 例如每个程序都是由用户通过用户接口分别进行初始化的,单一程序是由在 给定的数据集上的一个程序执行组成的,用户通过命令启动程序。程序可以 分为两种:顺序的和并发的。顺序程序符合传统的程序概念,是最简单的计 算结构。 《什第机专出美语 5-22Chapter 5 Operating System 计算机专业英语 5-22 These computational structures will be defined and described in later chapters; here we only point out a few salient features. It is assumed that each program is individually initiated by the user through the user interface. The single program consists of the execution of a program on a given set of data. The user initiates execution of the program through a command. Two kinds of programs can exist sequential and concurrent. A sequential program, which matches with the conventional notion of a program, is the simplest computational structure. 以上这些计算结构将在以后各章中定义和描述，此处只指出一些简单的特征。 例如每个程序都是由用户通过用户接口分别进行初始化的，单一程序是由在 给定的数据集上的一个程序执行组成的，用户通过命令启动程序。程序可以 分为两种：顺序的和并发的。顺序程序符合传统的程序概念，是最简单的计 算结构。 5.1.2 User interface related functions