I was in a heated argument with someone on IRC, when a notice popped up on my screen and told me something to the effect of "SOmeone has requested a shutdown using RPC .. Please save all work as computer will reboot in 30 seconds.. " SUre enough, after the 30 had passed, it rebooted.. Is this an attack by this IRC'er? If so, how did he/she do it, and how do I prevent it from happening again?