F-Keys for Server-commands

["Tibor D." <linux_ch@scientist.com>]

For a server I would program some F-Keys for maintenace. Without anybody 
logged in (you see just the console with the login prompt), I'd like 
e.g. following:
Someone presses F1 -> the server should shutdown
press F2 -> unmount/eject CDRom,
F3 -> print the IP-Accounting infos
F4 -> start the program "top" (or print some status-lines)
and so on.
How can I achieve that? So that you don't have to log in?
TIA for your ideas,
greetings,
Tibor