How to take screenshot on Samsung Focus S (SGH-i937)

Since Samsung Focus S (SGH-i937) is a Windows Phone device, you may click a screenshot easily using the following method

For Lumia Devices

Press and hold Power button and Volume Up button (on some devices: Start button and Power button) for about 2-4 seconds, in order to take screenshot.
You will hear a camera sound or outline frame to signal the screenshot being taken.
Release the buttons, then.
You will hear a click sound and your screenshot would be saved to Album/Screenshots and would be accessible via Photos hub.