See more Microsoft Office Word demos at http://office.microsoft.com/en-us/help/FX100485311033.aspx
The Tracked Changes feature in Word makes it easy for your team to collaborate on documents. In this demo, you'll see how to make tracked changes and comments, how to review them, and how to accept or reject changes. Word also offers several ways to do these tasks, and the demo explains your choices. It also shows you how to make sure all revisions are deleted from finished documents.