Sometimes it is helpful to view two different parts of your document at the same time.  In Word 2007, there are two ways to do this. 

(1) Split Screen.

The first way is to use the split screen view.  The split screen view “splits” the screen in two, and presents two different views of the same document.  To enter the split screen view either click the split button on the View tab:

and click on the screen to place the split; or hover the cursor on the black line above the scroll bar and click and drag to create the split:

The split screen will contain two different scroll bars that work independently to present two different views at the same time.  This makes it possible to look at pages 1 and 3 at the same time:

(2) Separate Screen.

The second way is to open a separate window containing the same document.  To do this, click the “New Window” button on the View Ribbon.

This will open a second window with the title “<Your Document Name>:2”, where <Your Document Name> is the name of your document.

Both of these windows show the exact same document.  Typing in one window will change the other (they really are the same document).  The only difference is that now the scroll bars work independently and it is possible to show different pages of the same document in different windows.  In the picture above, Page 1 and Page 3 are being shown in two separate windows.