12. The method of claim 8 , further comprising: receiving a second update at the first computing device, wherein the second update includes one or more edits to a second unit of data of the document; automatically applying the second update to the document on the first computing device; and providing a second annotation for display at the second unit of data of the document, the second annotation indicating that the second unit of data is being edited by a third user.
12. The method of claim 8 , further comprising: receiving a second update at the first computing device, wherein the second update includes one or more edits to a second unit of data of the document; automatically applying the second update to the document on the first computing device; and providing a second annotation for display at the second unit of data of the document, the second annotation indicating that the second unit of data is being edited by a third user. 13. The method of claim 12 , further comprising providing a first color for the first annotation to identify the second user and a second color for the second annotation to identify the third user.