9. The method of claim 8 , further comprising displaying a name of the second user as the first annotation.
8. A method for authoring a document at a first computing device, the method comprising: allowing the document to be viewed and edited by a first user on the first computing device; receiving a first update from a second computing device at the first computing device, wherein the first update includes one or more edits to a first unit of data of the document; automatically applying the first update to the document on the first computing device; and providing a first annotation for display at the first unit of data on the document, the first annotation indicating that the first unit of data is being edited by the second user.