Party Mode
Party Mode allows you to protect your Media Library while others are using Media Center. It grants them full, non-destructive and non-intrusive use of Media Center by allowing them to do just about anything, short of permanently saving or removing information from your Media Library.
To switch to party mode, go to View > Party Mode. To switch back to normal mode, uncheck "Party Mode" from the <View> menu.
When you switch back to normal mode, all temporary settings and changes that occurred while Media Center was in party mode will be replaced by your original settings.
Forget your password?
If you forget your password you can clear it in the Party Mode password dialog by double clicking on the "Man wearing the lampshade" image while holding down the Ctrl and Shift keys on your keyboard.