An animation that shows what happens when two people try to edit at the same time.
What happens when you don't take turns? The first one who edits the file will lock out the other person. In other words, two people cannot edit the same file at the same time.
In this animation, Don and Amy will enter their sales figures in the 2009 Sales Figures spreadsheet. Don will edit the file first. But when Amy tries to edit the file at the same time, she will get a File in Use message. Once Don closes the file, she'll be able to edit it.
Click Play to see this in action.