Contrary to what you might think, the "Print Screen," or "PrtSc," key does not attempt to send anything to the printer. The Print Screen feature of most keyboards interacts with Windows to capture an image of your screen onto your Windows Clipboard. If you have multiple monitors, the Print Screen feature will capture the contents of both screens, as if it were a single, wide desktop. However, you can also limit the screen capture to a single window.
Arrange your screen however you prefer. The easiest way to do this is to click and drag the title bar to move it. If the window is maximised, this will also put it in windowed mode, so it can be moved.
Press the "Print Screen" or "PrtSc" key, usually located on the top row of your keyboard. This send an image of the entire desktop to your Windows Clipboard.
Hold the "Alt" button and press "Print Screen" or "PrtSc." This captures and image of the window you are currently viewing.
Open any program that allows you to paste objects, such as WordPad or Paint.
Hold the "Ctrl" key and press "V" to paste the screen capture into the document.
Save the file and give it a name you'll remember.