Thanks to Edugadget (plain-talking technology reviews for teachers) for this: Wink is a free piece of software that is used to create tutorials. Their website says:
"Wink is a Tutorial and Presentation creation software, primarily aimed at creating tutorials on how to use software (like a tutor for MS-Word/Excel etc). Using Wink you can capture screenshots of your software, use images that you already have, type-in explanations for each step, create a navigation sequence complete with buttons, delays, titles etc and create a highly effective tutorial for your users."
The way it seems to work is with screenshots.You can add notes, etc and the software creates an animated presentation. there is a demo on the Wink website.