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I didn't have time to add subtitles or audio to this yet, but I think I can explain what's happening in the video. First, I just select a page and show some of the preview options available. Then, you can see how the system finds links in the documents and shows related pages under the "Related" tab. The first example is a little confusing because the page "aaaaaaaaaa" actually links onto itself. So it is related to itself under the related tab.
Now, here is where I show you some of the editing features. I'll pick a new Web page, html test. You can see that this file is related to the image usdjpy_1min_2007_11_13-1.png. This is a screen shot of USD/JPY currency pair at the date mentioned. First, I delete the image in the text editor and update the preview to show you that the image is indeed gone. The, I'll move some of the other links around with BR tags and add the image back in with a little description of it. So far, none of the edits are saved, the preview works on the raw HTML as you are working on it. Only when you hit save do the changes get saved, also, nobody can view your changes until you are ready to publish the latest version of any page.