XBox360 Wireless Controller programming

I've been trying for days to find out a way to turn off a Xbox 360 Wireless controller. Accordingly to the msdn site, the only thing you can send to the controller is something to set the vibration intensity. Does anyone know if there is a c function or something that will allow me to turn off the controller? It has to be idle for more than 15 minutes to turn off by itself.
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