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This is a way of collaborative work where the main method is asynchronous but with occasional synchronization to share progress. https://faculty.cc.gatech.edu/~keith/pubs/autonomous.pdf
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In timewarp, document histories are flexible. Therefore, changes can be made to a document at any point in its history, and these changes can propagate to later states. Sometimes these changes may cause inconsistencies, and how timewarp handles these inconsistencies is discussed later.