The S is for an oscilloscope, a device that lets a person see graphical presentations of electrical phenomena. In this case, it's your voice. If you are using the hardware that was custom designed for Super Start, pressing C will allow you to calibrate it. If you are using a standard sound card, it will show the numbers representing the strength of the signal change as you speak in the microphone.
Kids like to watch that, too.
The home key takes you to the left column, and the end key to the right column. Page down takes you to the next page if there is one, and page up to the previous page. Hold down the control key and press the home key to go to the first item on a page. Hold down the control key and press the end key to go to the last item on a page. Hold down the alt key and press the home key to go to the first page.