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USB devices can provide a remote wakeup function for the computer. The USB root hub in the computer is set to support remote wakeup whenever a device is attached to the bus. The device wakes the computer by sending a Resume event to the USB root hub. The mouse and keyboard that come with the computer use this method to wake the computer on a key press or mouse click.
This functionality is part of the USB-suspend mode defined in the USB specification. Information about the operation of USB-suspend mode on Macintosh computers is included in the Mac OS USB DDK API Reference, available on the World Wide Web at http://developer.apple.com/documentation/Hardware/DeviceManagers/usb/ usb.html