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Screencastify - if you have not already seen it....

Screencastify is a Chrome extension that allows you to record the content of one tab - so video and either the audio from your mic or the tab. Its particularly useful on a Chromebook as the only other way of recording the screen is to use a Hangout on Air. Hangout's on Air do allow you to record the whole screen - not just the active tab and in my experience give better results. However, you can only do them if you are 18 and this app can be used more easily by students.

Videos can be downloaded locally or directly sent to YouTube. I've tried doing them on my Pixel (see video), a Toshiba Chromebook and a Samsung Series 3. The Series 3 produced choppy video and audio unless I dialled the capture resolution right down. The other two Chromebooks and my PC worked fine at any resolution. So it needs a little bit of grunt to work well. If I wanted to screencast on a Series 3, I'd stick to a Hangout on Air.

This is the results from my Pixel:

Just a bit of an update - there is an option to record the full screen - you need to turn on a Chrome flag for this to work - but it helpfully points you towards the right one. Tried this on my Windows 8.1 PC and it recorded a video - but seemed to lock the screen so I could not do anything. However, tried the same thing on my Pixel and it worked fine. The result of my experiment is below:

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In the example above, the bookmarks are applied to the sub-OU of 'students' - so all our students will get these bookmarks. Simply add your url and the bookmark name, click the + and save. These will appear in a folder called 'yourdomain bookmarks' - see below:

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Video Guide: