Flashes a bar to mark the end of the previous page when you use a scrollbar control or the Page Down key to scroll down a page and reach the end of a document. When you reach the end of a document, often the page has scrolled up just a few lines rather than a whole page... and you have to scan back over a whole page you've already read to find the new lines at the end. With PageMark, you won't waste time figuring out where you are, since the flashing indicator shows you exactly where the previous page ended.