需要用直接连接到计算机上的键盘来物理访问计算机。
We need physical access to a computer with a keyboard hooked directly to it.
今天，许多周边设备和装置都是通过USB接口连接到计算机上的。
Today, many peripherals and devices connect to computers through USB interfaces.
您可强制stdin从文本文件、设备(比如连接到计算机的探头)或网络连接中进行读取。
You can force stdin to read from a text file, a device (say, a probe connected to the computer), or a network connection.
应用推荐