alert me when somebody connects to my pc

Hi!
A friend of mine told me that everybody can connect to my pc and i will not even know about that. So i want a program to alert me when somebody connects to my pc.

tnz

Category: alert remote-access security track
I think you need a firewall, and if you are on Windows then you already have one - Windows Firewall
you can monitor your internet connection with http://www.softperfect.com/products/networx/

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