How to rotate your computer screen

You can rotate  screen of  your computer by 90 or 180 or 360 angle through a simple action .         Steps 1.        Press Ctrl, Alt and then any of the four arrow keys . ----------------------------------------------------------------------------------------------------------                                Down arrow key rotate by 180 degree, invert screen.                                Left arrow key rotate by 90 degree.                                 Right arrow key rotate by 270 degree                                 Up arrow key make it normal again.