How to Shut Down the System
The Win32 API provides two ways for an application to shut down local or
remote computers:
- Shut down the system.
- Shut down the system and restart it.
Windows NT: The calling process must have the SE_SHUTDOWN_NAME privilege to shut down the
system.
An application can use the
ExitWindowsEx function to shut down the system. The system sends the
WM_QUERYENDSESSION message to each window, unless
ExitWindowsEx is called with the EXW_FORCE flag. While processing WM_QUERYENDSESSION, the
applications perform any cleanup and return TRUE to indicate that they can be
terminated. If EXW_FORCE is used, applications may lose data. For more
information, see
Shutting Down.
Windows NT: The
InitiateSystemShutdown function starts a timer and displays a dialog box that prompts the user to
log off. While the dialog box is displayed, the
AbortSystemShutdown function can stop the timer and prevent the computer from shutting down.
However, if the timer expires, the computer is shut down.
InitiateSystemShutdown can also restart the computer following a shutdown operation. For more
information, see
Displaying the Shutdown Dialog Box.
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