Unknown download/upload traffic
 

I have only just installed LW basic and I am new at peer to peer. I have NetTraffic running in the background which shows realtime traffic on my router connection. I am worried by intermittent traffic both upload and download when I am not downloading anything with LW. Also, when I close LW by clicking the X this traffic still pursists.
WHAT ARE THESE BACKGROUND UPLOAD AND DOWNLOADS DOING TO MY PC?:confused:

Please don't double post. Was already answered here: http://www.gnutellaforums.com/showthread.php?t=55628