Watching bootup messages

[jrv at mbunix.mitre.org (Jim Van Zandt)]

Scott Ehrlich writes:
>An undocumented (at least in the HOWTOs, but documented supposedly in
>the code, and pointed out by Linus when we spoke at MIT) was the
>ability to get special info via CNTL-Printscreen, ALT-Printscreen, and
>Shift-Printscreen.   (At least I think it was the Printscreen key he
>used).

On my machine, with 1.2.9 kernel, alt-printscreen toggles between two
VCs and neither cntl-printscreen nor shift-printscreen seem to do
anything.  

However, shift-scroll lock, cntl-scroll lock, and right alt-scroll lock
dump some interesting things into /var/adm/messages.

Also, I don't find documentation anywhere in the kernel source tree
(i.e. searching for the strings "printscreen", "print screen", or
"scroll lock").

                                    - Jim Van Zandt