Open the two documents that you want to display side by side. (For now, open only these two documents.)
Open the Window menu and choose Compare Side by Side with document name .
The documents are arranged side by side and the title bar of the active document is dark. To activate the other document, click anywhere in its window.
Try using the scroll bars and changing the zoom setting on one document to control both documents at the same time.
INTRODUCTION
When you have two versions of a document and want to compare them side by side, you can easily arrange your Word window to do so with a click of the mouse. Once the two documents are aligned side by side, scrolling or zooming one of them scrolls or zooms them both, making it easy to scan both documents at the same time.
To break the side by side arrangement, click the Close Side by Side button on the Compare Side by Side toolbar.
Open a third document, switch to one that you want to compare, and open the Window menu. No document name is appended to the Compare Side by Side with command.
Choose Compare Side by Side with . In the dialog box that opens, click the document that you want to compare with the one that's currently displayed, and click OK .
Word displays those documents side by side. Click the Close Side by Side button in the Compare Side by Side toolbar to restore each to its previous size and position.
HINT
Seeing More of Both Documents
If you can't see the entire width of both documents when they are set up side by side, you might want to experiment with increasing the resolution of your Windows XP display. To do so, right-click a blank part of your desktop and choose Properties in the menu that appears. In the Display Properties dialog box, click the Settings tab, and drag the Screen resolution slider to the right to increase the resolution. Click OK , and then click Yes when Windows asks if you want to keep the changed settings.