NETWORK/INTERNET VB

does anyone know any good sites or tutorials where i can learn or they have posted some VB network/ internet commands so i can send files or text over the internet through a server or IPs ANYHTING will be helpfull.. i am trying to make a program simmilar to ICQ. ANYHTING and i mean ANYTHING at all will be helpfull ...
THANX IN ADVANCE!!!!!!!!!!!!!!


-RC