PSS is a program designed to take over the function of the default windows print screen button, it does this to then give itself the ability to take images of your desktop without the use of windows features, this allows you to then save the image it captures anywhere you like with any file name you like, you can even resize it and all this happens automatically, so just set it up how you like and then close the window as PSS runs in the tray so it can stay out of the way and take up the smallest amount of screen space as it possibly can.