How does ICQ know a connection was made?

I can see that the ICQ program has an agent that "knows"
when a network connection was made (through dial-up,LAN etc.).
How do they do that (from their source code)?
Thanks.
gilbert_changAsked:
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MikeP090797Connect With a Mentor Commented:
You can use RasEnumConnections to enumerate all the active connections. Do that in 15 secs intervals, and you will get the same effect as ICQ
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MirkwoodCommented:
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