Info Transmitted

I've just started using the program and I like it, seems to be the best out there. My question is, I noticed that whenever the program is running, there is almost as many bytes being sent from my computer as what is being received. I know anytime on the net my computer is communicating & info is being sent (and no, no songs being uploaded), but a whole h**L of "ALLOT" more is being sent now then what was ever tranmistted when using Napster or any other net program. What is all the information being sent or passing through my computer. Just curious if anyone has any ideas. Thanks.