Thanx everyone for help... I found these links and they seem to be helpful:
http://www.ecst.csuchico.edu/~beej/guide/net/html/
http://www.snible.org/winsock/
http://msdn.microsoft.com/library/de...ets_in_mfc.htm
http://www-c.informatik.uni-hannover...ket++_toc.html