These pencasts are synchronized recordings of the audio that is recorded and the notes my pen records as I write them. So the best way to utilize these videos is to watch them and click on certain areas of the written notes to jump to, jump back to, repeat or emphasize the audio of a thing that is written. Example:
If halfway down the first page you see the outline of ITO FORMULA written on the page and you only care to review the ITO FORMULA you can use the red dot to pinpoint those words and click them to jump the audio and written notes to that point in time when the ito formula is being discussed. This obviously allows for a saving of time and a much more pointed reviewing process.