A screencast is a video of anything that was on your screen when you created it: Web page, picture, moving image, etc.
If your cursor was on-screen, the screencast has it. You can use it to highlight anything on the screen.
If you have an external microphone plugged in, you can narrate whatever is on screen.
A screencast is great for teaching. For over 200 sample screencasts, go here.
You can get a very good screencast program here: www.screencast-o-matic.com. It's free (with advertising watermark) or under $20 a year without.
For all 20 Lessons, go here: //www.garynorth.com/public/department137.cfm.
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