9. The method of claim 1 , further comprising: receiving a third update from the second computing device at the first computing device indicating that a third user is editing the document at a third location; automatically applying the third update to the document on the first computing device; and at the first computing device, providing a second annotation identifying a name of the third user displayed on the document at the third location indicating that the document is being edited by the third user at the third location.
10. The method of claim 9 , further comprising identifying the second user by a first color and identifying the third user by a second color, wherein the first color is different than the second color.