从使用者的角度看，操作系统使得计算机易于使用。从程序员的角度看，操作系统把软件开发人员从与硬件打交道的繁琐事务中解放出来。从设计者的角度看，有了操作系统，就可以方便地对计算机系统中的各种软、硬件资源进行有效的管理。-From the user' s point of view, the operating system makes the computer easy to use. From a programmer' s point of view, the operating system software and hardware developers from dealing with the liberation of the complicated transaction. From the designer' s point of view, with the operating system, you can easily in a variety of computer systems hardware and software resources for effective management.