Playing a DVD movie already in your drive
If you already have a DVD movie in your drive, but you have been doing other things in Media Center or in other programs from your desktop, you can play the DVD by:
1 Pressing the Media Center Start button 
on the remote control.
2Selecting Play DVD. The DVD movie begins playing in
Programming Remote Control Buttons for DVD
To select DVD remote control options while viewing the DVD:
1In the Media Center Start menu, select Settings.
2In the Settings window, select DVD.
3Select Remote Control Options.
4Select Skip Chapters or Skip Forward.
5Select an option, and then select Save.
126Microsoft Windows XP Media Center Edition 2005 Reference Guide