Vista’s Answer to PC Power Woes
For off Windows XP machines offer several options - including hibernate, stand by and shut down. However, many users don't know the difference. What's worse, however, is that applications and drivers can veto a user's decision to hibernate or similar. In Vista however, applications will be warned that a computer is entering sleep and have a second or two to save what ever they need to, but the programs won't get a say in whether the machine slumbers.