Further information about how and what to trigger things with the Magic-Sysrq-Key is documented in $KERNEL/Documentation/sysrq.txt, which you can access for exa

Further information about how and what to trigger things with the Magic-Sysrq-Key is documented in $KERNEL/Documentation/sysrq.txt, which you can access for example in Linus' GIT tree at... http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blob_plain;f=Documentation/sysrq.txt;hb=HEAD http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6... One very useful function, for example, is to force a hard reboot when ssh'ed into a server: echo b >/proc/sysrq-trigger