At the top of the screen, two traveling sine waves are shown. They have the same wavelength but are traveling in opposite directions. At the bottom of the screen, the superposition of the two waves is shown. The result is a standing wave.
The program recognizes the following commands. The command may be executed by either clicking the button with the mouse (first column below) or by pressing a key (second column below). The mouse buttons may be removed from the screen by pressing the M key. Press M again to restore buttons.
| stop | s | Stop animation. Press stop again to resume animation. |
| const | c | Constructive interference demonstration. The animation stops at the point where the two waves constructively interfere. Press const again to resume animation. |
| dest | d | Destructive interference demonstration. The animation stops at the point where the two waves destructively interfere. Press dest to resume animation. |
| node | n | Node demonstration. A vertical line appears, showing the position of a node. Press node again to remove line. |
| antinode | a | Antinode demonstration. A vertical line appears, showing the position of an antinode. Press antinode again to remove line. |