Ok this is a little trick to turn off computers of a network just sitting on your chair.
1- goto start and type into the execute box "cmd", now you should have a little black form on your screen.
2-type one of the following commands:
shutdown -s -m \\pcname -t 0000000001 -c "comment"
shutdown /s /m \\pcname /t 0000000001 /c "comment"
now a little explaination, shutdown is the command to turn off the pc, -s tells that you want to turn it off, you can also disconnect or reboot it; -m tells that you want turn off a pc with a particular name, \\pcname is the specification of that name.
-t tells that the pc will shutdown in 0000000001 seconds(i dont think that you can abort the operation in that time)
in the end -c tells that u wanna show a little message box on the pc first to turn it off i show you an example with pics.
http://img52.imageshack.us/i/40717801.png/
here i press start and open cmd
http://img156.imageshack.us/i/cmd.png/
this is the cmd
http://img171.imageshack.us/i/23775642.png/
you can see the command, i told to shutdown my other laptop, wich name is PORTATILE in 123 seconds with the comment "PWND!"
http://img294.imageshack.us/i/38007706.png/
here is the screenshot of the other pc, dont worry about the name Bembilotto_2 it's the same on both pc's cuz its my account.
hope you enjoy it, shutting down your teacher pc have no price, for all the other things there is mastercard!