1.SysSockCreate 2.SysSockBind 3.SysSockListen 4. After completing the above 3 steps, use SysSockAccept to receive the client socket. 5. Push the received multiple client sockets into a SOCKET_FD_SET structure How can I know which socket has data coming in? The following is my test code, I found that SysSockselect can only detect SOCKET_FD_SET.fd_array[0]. Suppose I save the second TCPSocket into SOCKET_FD_SET.fd_array[1]. When data comes, SysSockselect cannot detect it.