I suppose you are talking about the Web url h**p://r00t.nu/ which brings up a screen with the following:
Debian GNU/Linux potato/stable aziz tty1
Linux 2.4.7 on an i686
Login: _
After waiting a little while, a Microsoft Internet Explorer message pops up with:
"Format complete!
Put your Linux CD on your CD-ROM and reboot to install Linux"
So I guess that it is related to a procedure for installing Debian Linux. It also has a message at the bottom of the screen that says "Formatting C drive completed", so this could also be a dangerous procedure unless you know what you are doing.
My advice is unless you know what you are doing,
DO NOT ACCESS THIS ADDRESS ON THE WEB. As far as I can tell, my C: drive is still intact and nothing new has been written to it so I assume that message was harmless.
See
Site map for Debian web pages for further information.
The .nu country code stands for Niue, an island near New Zealand. See
Niue Island.