FB'ers, this was on the ADB I/O discussion list; I thought somebody here
might have some advice or dis/encouragement. :)  So I offered to forward it
here for him on his request. I seem to remember a similar discussion on
this a long while back.

Original message from:  Brad Midgley <brad@...>

>Date: Sat, 26 Sep 1998 14:10:43 -0600 (MDT)
>From: Brad Midgley <brad@...>
>Subject: disabling keyboard actions

>has anyone made a hardware device or any other workaround to disable
>things like zapping pram from the keyboard during boot? how about
>preventing entering open firmware (control-command-O-F)?
>
>i am going to make some macintosh machines running linux available and i
>want to prevent some simple things that users could do to mess up the
>machines...
>
>do any programmer types know if there's a way to tell an adb keyboard to
>disable the control-command-power reset sequence? apparently some cuda/pmu
>command needs to be issued.
>
>thanks
>brad