If you want to see what connections are open on your pc to the network and the web, open up your command window in Windows:

start -> run -> cmd

then type in this and hit enter:

netstat

This will show you all open ports on your pc. This is useful if you're curious about how something like Windows XP service pack 2 actually is blocking your web and network connections, in this case, the MS firewall is next to useless since it only blocks incoming traffic, and leaves a lot of outgoing ports open, some extremeley dangerous ones, such as the one that allows someone else to do a remote control of your PC, a windows XP 'feature' that is the joy of hackers around the world.
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