In August 2005, Microsoft filed for a patent to more efficiently shut down its Windows operating system as well as other operating systems, including Apple’s Mac OS X, and override running programs that may prevent Windows from closing. That particular feature has been implemented for some time in Windows and is known as the notification screen just before the actual shutdown, if a user has requested Windows to close and other programs with open and unsaved documents are still running.
Вот как выглядит схема выключения http://www.conceivablytech.com/wp-content/uploads/2010/09/microsoftpatentapp.jpg
Пруф: http://www.conceivablytech.com/2530/products/microsoft-patents-operating-syst...