I've just come across some software that lets you move the mouse cursor by moving your head:

Camera Mouse

It does this by using a laptop's webcam to detect head movements.

It is free. My thanks go to the people at Boston College who have made this possible.

John

PS no one has yet identified the English folk song that I put through voice recognition software. Another clue: it was written by the husband of the sister of a person who helped inaugurate Obama.