How to Switch to the Open Document Activities in Word
- 1). Open the Word documents that you want to use by double-clicking the Word file icons one by one.
- 2). Click the "View" tab in the Word window.
- 3). Click the "Switch Windows" button on the View tab, and then click the name of the file to which you want to switch on the drop-down box that opens. The files that you opened will be arranged in the box in chronological order, with the most recent file that you opened at the top of the list.
Source...