How To Make ASP Automatically Print To A Certain Printer Or All Printers

Problem is, when there is a fire we need to check who is out and who
is burning. I have been trying to think of how to go about this,
perhaps the only way is by having an 'emergency print' button that
quickly prints thedocument to one, or even better all printers on the
network. That way when everyone is leaving they can grab the print
from the printer.

Probably the only other way is to make it email a list of all the
people who are not signed out and send it to someone with a PDA phone
I guess.

So my question is, how do I get it to have a button you click which
will print the page to a printer without needing any further input.
Also, is it possible to make it print to a certain printer on the
network, and can I make it print to a list of printers (or even just
any printer it can find).