The key program was the operatingsystem, both on servers and on personal computers (" clients ").
对服务器和个人电脑(“客户端”)来说，关键的程序是操作系统。
2
The name of the file is removed from the file system, and its storage space is recovered by the operatingsystem when the program using it closes the file.
这将从文件系统中删除该文件的名称，当使用该文件的程序关闭它时，操作系统可以重新获得其存储空间。
3
But the computer scientist definitely will understand what's happening in the compiler, operatingsystem, and CPU when a program is compiled and run.