 automatically clip the document to the View's boundaries and will notify the application whenever a portion of the View has become invalid (whether by scrolling, sizing, moving, or being uncovered by movement of another object). The application simply must draw the document whenever notified that a portion has become invalid; it does not have to do any calculations regarding what is visible on the screen (though it might if the document is especially complex).</LI>
<LI>
Automatic scrolling<BR>
By setting t