Scrolls the message frame's contents up by one page. One "page" is slightly less than the number of lines displayed in the frame.
World of Warcraft™ and Blizzard Entertainment™ are trademarks or registered trademarks of Blizzard Entertainment, Inc. in the U.S. and/or other countries. The original materials contained in the API Reference section of this website are copyright John Wiley & Sons. Other copyrights on this page are owned by their respective owners. All other content © 2008-2013 wowprogramming.com.