if you want, you can put more one line to performa a shutdown without confirmation:
SendKeys "%+{F4}"
SendKeys "ENTER"
The "ENTER" will confirm the exit without a user's confirmation. (I always hated the close confirmation)
Using the config of windows its possible remove the title bar and close buttons, using only our close button. Also is possible run on fullscreen hidding all windows plataform. If is interesting for you, i can upload the ConfigFiles and help to do this...
Regards,
Róbson Machado Rosa
Brazil