In Illustrator CS4, when you open more than one document at a time, they are organized in windows that are Tabbed going across the top of the screen. One of the first things I tried in exploring this upgrade was to see if the Tabs could be reordered in the same way as tabbed panel groups in CS3. And the answer is absolutely! To give it a try, open three or more Illustrator documents at one time. To reorder the document Tabs, simply click on the Tab you wish to move and drag it to a new position to the left or right.

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