"wake on lan" allumer un pc distaaaaaaant :p

After you enable WOL in your motherboard's BIOS, boot into your OS. I typically use Linux. In order for the halt command to power down the computer you must have the apm module loaded first. Now, issue the halt command, and the computer should turn off, but, the LAN jack indicator LEDs should still be lit.

http://www.commentcamarche.net/faq/18977-eteindre-allumer-un-pc-a-distance-shutdown-wake-on-lan