Windows 10 preview lets Cortana play music, turn off your PC
 

Cortana is the star of a big new Windows 10 Insider Preview build. Microsoft says that voice control of your PC was one its "top requests," so the latest update now lets you shutdown, restart, lock or sleep your system using the voice assistant. You...

https://www.engadget.com/2016/12/08/...n-off-your-pc/