Toggling Between Open Programs

I was recently conducting a presentation in which I was toggling between Internet Explorer and PowerPoint. Someone asked after the presentation how I did that.

To toggle between open programs, press and hold the Alt key and then hit the Tab key. In the middle of the screen, you will see icons of all open programs. Each time you hit the Tab key (while still holding down the Alt key), you move to a separate program. To go to the selected program, let go of the Alt and Tab keys.