This site is amazing.

If you are computer literate and your Grandparents are not, You can show them from afar. From the the simplest to the most arduous of tasks, by recording your movements or demonstrations and posting too YouTube or copying the video to a blog, then all they have to do is go to your link and watch how its done.

This is the URL
http://www.screentoaster.com/

To use the site simply click on the URL.

You will see this screen:
(click to enlarge)

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Here is an example of a finsihed "video"

http://www.screentoaster.com/watch/stVElRRUBIR1xeQ1xcWV5cUFNd

Me browsing my PC

http://www.screentoaster.com/watch/stVElRRUBIR1xeQ1xYXV1YUFZW