*you could , if one of them leaves the room , take theyre computer for a second , quickly type into start run then in run type cmd then in cmd type 'ipconfig' (without quote marks) then beside where it says IPv4 Address .... that is theyre ip , quickly remember it,note it down , whatever you want just to remember it , then put theyre computer back , open cmd on your computer type shutdown -i , then click Add , then type theyre ip in there and click on ok , then choose what you want these computers to do , shutdown , restart or anotate unexpected shutdown , you can warn them of it for 30 seconds or your desired time , or you can untick that part and itll just shtdown immediatly , NOW... the fun part :~D ( <-- lol jizz nose ) ok NOW again, the even better part :p down the botton put in the comment what you want it to saybefore it shuts down , ( it'll pop up on theyre computer ) you could type , WARNING , unexpected error #25f8041 ... It appears your gay and your computer has to shutdown ... or you could just put something smart: e.g ... Warning! Unexpected Shutdown error in C: drive and windows( or whatever he uses ) has to shutdown ... Goodluck xD

*you could , if one of them leaves the room , take theyre computer for a second , quickly type into start run then in run type cmd then in cmd type 'ipconfig' (without quote marks) then beside where it says IPv4 Address .... that is theyre ip , quickly remember it,note it down , whatever you want just to remember it , then put theyre computer back , open cmd on your computer type shutdown -i , then click Add , then type theyre ip in there and click on ok , then choose what you want these computers to do , shutdown , restart or anotate unexpected shutdown , you can warn them of it for 30 seconds or your desired time , or you can untick that part and itll just shtdown immediatly , NOW... the fun part :~D ( <-- lol jizz nose ) ok NOW again, the even better part :p down the botton put in the comment what you want it to saybefore it shuts down , ( it'll pop up on theyre computer ) you could type , WARNING , unexpected error #25f8041 ... It appears your gay and your computer has to shutdown ... or you could just put something smart: e.g ... Warning! Unexpected Shutdown error in C: drive and windows( or whatever he uses ) has to shutdown ... Goodluck xD

It doesn't work for me

One of my friend :

When i open his cmd there is no "IPv4", so i take the number beside "IP adress".

I take back my computer i type shutdown, ...
But when i click on "ok" there is a message on cmd "Impossible to make te connexion" (Error 1326)

Other friend :

I type ipconfig but there is no ip adress