That's an awesome addition to Windows 8. In previous Windows versions, whenever you needed to take a screenshot of your screen, you had to press "PrntScr" key or if you wanted to take screenshot of a specific program window, you needed to click on it to make it active and press "Alt+PrntScr" keys. After doing this, the screenshot was captured by clipboard and you had to paste and save it using an image editing softwarelike built-in MS Paint, Adobe Photoshop, etc.
