Trying to tell anther user how to use a particular bit of software isn't always easy. Hands on demonstration is always the preferred method. Load the software and show someone face-to-face how to perform a particular task. However, if the other person is over the phone or you need to show a group of people, perhaps through a presentation, you'll need to perform and record your actions to video.
Camtasia 4 is a professional-level tool that will enable you to record actions of anything that is displayed on your computer. You can grab mouse movements, add various effects and then export this as a movie for displaying on the web or even a mobile phone.
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