How to detect what process is making a connection?

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M\Shawn T. Rutledge
||MShawnT.Rutledgerutledge@cx47646-a.phnx1.az.home.com
||Mder.hansPLUGd@LuftHans.com
|Mder.hans
|MGregGreg.Furmanek@hit.cendant.com
|MFurmanek, Greg
MKevin Buettner
MKevinBuettnerkev@primenet.com