shortcut keys

I need to create a keyboard shortcut that will shutdown the computer, I already tried the method presented in this third-party project (Windows 7 create a custom keyboard shortcut for your application), and worked at first, but then stopped working; and I couldn't use it on other desktops. How...

The Windows + Q shortcut (Cortana pop-up search) suddenly stopped working. Is there an Registry Edit or something to bring it back to life? Thanks in advance.

To open Task View press [windows key] + [Tab] To move around your tabs or add another, first press [Tab] then use your [left arrow] and [right arrow] to move across the tabs or hightlight the +desktop button. edit: press [enter/ return] to open the hightlighted tab once you have it sellected.