Salve,
invece di mandarti qualche link in privato, li posto qua, magari possano servire a qualcun altro.

http://telemat.die.unifi.it/book/199...ck%20asincrone
http://msdn.microsoft.com/library/de..._functions.asp
http://msdn.microsoft.com/library/de...astartup_2.asp
http://www.sockets.com
http://www.ukhp.info/winsock
http://www.hal-pc.org/~johnnie2/winsock.html
http://www.nexit.no/wsock.html
http://www.sockaddr.com