- If the applet becomes smudged, or to reset the initial values at any stage, click "init" (initialise).
- To change the parameters (here x1, y1 and m) click on the slider up-down arrows.
- To clear traces, click "clear".
- To move point P, click-hold and drag the point, or click the x1 and y1 sliders.
- If you left-click and hold in the applet, the co-ordinates of the point are displayed.
- To change the scale or "pan" the window, click the sliders at the top of the applet.
- If active, you can type an equation into the input box and press ENTER.
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