2008 Mac Pro Accesses the Internet Constantly

I have noticed that when I'm using my MacBook Air it is very slow to load pages.  I looked at my router and noticed that the MacPro was continuously accessing the internet.  I pulled the cable and voila my MacBook Air was now fast again.
I don't have any programs open that need internet access so what is using all this bandwidth?
Thanks
Alan

I recommend that you get a littlesnitch. littlesnitch will track your Web traffic and tell you which applications are sending data from your computer. Be sure to run it awhile because it will trigger a number of alerts. In trail mode, it will run for three hours per boot for a about a month.
http://www.obdev.at/products/littlesnitch/index.html

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