I didn't get any tutorial of the new features with the hot corners etc.. Never got any introduction. I googled it and closing apps is described here: http://windows.microsoft.com/en-us/windows-8/how-close-app

Funny part is that it just doesn't work with a mouse. It does work well on my Win8 tablet.

Also, I didn't wanna use the power button since I wanted to actually restart it. (Actually I was in a VM).