它指示这是否是一个高优先级消息，必须在所有其他消息之前进行展示——例如，一个关键脚本停止工作。
It indicates whether this is a high-priority message from the system that must be presented before all other messages-for example, that a key script has stopped functioning.
当你在xp系统中点击安全删除硬件时，指示灯熄灭，USB设备停止工作。
When you click Safely Remove Hardware in Windows XP, the power indicator turns off and the USB device powers off.
USB设备指示灯仍然是亮的，而并你所非预期的那样指示USB设备已经停止工作。
The power indicator for the USB device is still on. You would expect the power indicator to show that the USB device is powered off.
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