This is a simple procedure that can be done via WMI or the application. Say you want to shutdown computers in SMS that are logged out. Maybe to save money on long breaks for for whatever reason. Simply send the command:
shutdown.exe -s -t 30 -c "SMS Shutting system down"
If you wish you can run it from the computer or place it in a package and send it down to the computer. This will shutdown in 30 seconds with a warning. If you what you can add the -f to force any applications that might be running to close