How do etherpad & Google Docs do ChangeSets

Posted by nobosh on Stack Overflow See other posts from Stack Overflow or by nobosh
Published on 2009-12-17T00:19:21Z Indexed on 2010/05/22 2:51 UTC
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I'm curious to learn how Etherpad and Google Docs automatically save data. When you're writing a text document the products send only the changes to the server. Any idea how this technology works and where I can go to learn more about the end-2-end?

Thanks

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