How does Windows detect it is online?
I always assumed that Windows assumes that it is on the Internet when there is a default gateway.
Turns out this is not the case!
How does it judge, it is on the Internet? Does it "phone home"?
As documented at
http://technet.microsoft.com/en-us/library/cc766017(WS.10).aspx
nslookup dns.msftncsi.com followed by HTTP GET www.msftncsi.com/ncsi.txt