Just as with your other thread, follow the link in the articles your read about those products. They will send you to the official pages of those tools and will give you the detail explanation you seek.
If you don't have links to the official homepages of such products, do a simple google search (in this case the official link is the first one to come up when you search for "windows live writer").
http://windowslivewriter.spaces.live.com/
^^ everything is explained on that page, attempting to explain it again here would be just copying what has been written there...
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