Rebooting the Magic Way Aug 22, 2008, 14 :02 UTC (0 Talkback[s]) (5959 reads) (Other stories by Cory Wright)
"In addition to rebooting the system the sysrq trick can be used to dump memory information to the console, sync all filesystems, remount all filesystems in read-only mode, send SIGTERM or SIGKILL to all processes except init, or power off the machine entirely, among other things."