UnhappyStar_7 I agree with Tiger Shark. Log and see if it conflicts with AUP
You said you are not familiar with Win2K/NT so you are perhaps with *nix
If you are, set up a simple linux box, install ethereal
from www.ethereal.com and filter out the traffic from that specific host. Output to a file and there's your proof.
a good tutorial on:
http://www.cs.uh.edu/~jsteach/cosc43.../ethereal.html