你能用它作为你的应用程序的主窗口或者用它作为输入设备。
You can use it as the main window of your application or use it as an input device.
用户可以通过一台计算机来访问应用程序，用鼠标和键盘作为输入设备，用显示器作为接收反馈信息的设备。
Users access applications through a computer, using a mouse and keyboard as input elements, and a monitor as feedback.
这个输出并不是唯一的，就是说，我们可以使用一些特殊的符号，将很多命令的输出结果重定向到文件，设备，甚至作为其他命令的输入。
This does not have to be the case, however. By using some special notation we can redirect the output of many commands to files, devices, and even to the input of other commands.
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