What happens once an user click shutdown button

when an user clicks shutdown button, what OS does
1. will it stop all the process running in the background right away and spend time in closing those?
2. apps (exe) which were running won't be having any control and it is fully operating system which does everything
to kill all the running processes right?
3. What is the exact flow that OS follows to kill apps when shutdown button is pressed.?

Hello Sarath_dnv,
About the Windows Shutdown details, please take a look at the following article.
http://blogs.msdn.com/b/b8/archive/2011/09/08/delivering-fast-boot-times-in-windows-8.aspx
1. The user initiates a shutdown by selecting “shut down” from the Start menu, or by pressing the power button; or an application initiates shutdown by calling an API such as ExitWindowsEx() or InitiateShutdown().
2. Windows broadcasts messages to running applications, giving them a chance to save data and settings. Applications can also request a little extra time to finish what they’re doing.
3. Windows closes the user sessions for each logged on user.
4. Windows sends messages to services notifying them that a shutdown has begun, and subsequently shuts them down. It shuts down ordered services that have a dependency serially, and the rest in parallel. If a service doesn’t respond, it is shut down forcefully.
5. Windows broadcasts messages to devices, signaling them to shut down.
6. Windows closes the system session (also known as “session 0”).
7. Windows flushes any pending data to the system drive to ensure it is saved completely.
8. Windows sends a signal via the ACPI interface to the system to power down the PC.
Best regards,
Fangzhou CHEN
Fangzhou CHEN
TechNet Community Support

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