计算机关闭时，网卡仍让处于工作状态，并且准备接收封包，网卡（连接到网络）接到魔术包（自定义的特定内容封包）之后将试图启动计算机，该机制依赖硬件性能-The computer is turned off, it still provides the network card in a working state and ready to receive packets, the network card (to connect to the network) received a magic packet (since the definition of the specific content of the packet) will attempt to restart the computer after, the mechanism dependent on the hardware performance