I know a lot of people use the winsock to develop the online project. But the csocket doesn''t have the thread problem. Why don''t so seldom person use the csocket? I have a project that is simlar to icq or msn, but it support more function. It provide some small game that could connect with each other. And can transport the voice or video via the appropriate hardware. I don''t know how to use which of them is better one. Is csocket or winsock? I know the csocket member class is less than winsock. Another my big problem is how to transport the voice and video . Just like the msn''s Net meeting. But it''s one-to-one through the net. I almost can''t find any information about the voice and video.