I have a room full of Windows XP machines and I want to shutdown all the machines remotely with my Mac (10.8.2).
Can this be done and if so, how?
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Follow this tutorial to configure the windows machines: http://www.howtogeek.com/109655/how-to-remotely-shut-down-or-restart-windows-pcs/
Then install samba: http://forums.boxee.tv/showthread.php?t=38629
Then use the net command to execute the shutdown command just like from linux: http://www.commandlinefu.com/commands/view/2330/shutdown-a-windows-machine-from-linux
If that works you can make a sh file with the command repeated for all the ip addresses of all the computers.