security problem: console text gets sent to printer

["Jason Dunsmore" <jasondunsmore@gmail.com>]

On two different occasions over the past month, text from the console
was sent to the printer.  It prints 3-4 copies of 2-3 pages from the
console.  The text is printed out just like it's shown in the console,
with both the commands and their output.

I use urxvt as my X console, and I run several bash sessions inside of
screen.  Only the text from one of the sessions printed.  The first
time text was printed from the root account, the second time it was
from my user account.  The last command I typed before text started
printing was xlock.

I'm running the latest Etch with 2.6.16-2-686-smp.  This is a pretty
big security problem, since my computer prints to a shared printer.
Any idea what's causing it?

Thanks.