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This data type is able to be used for both UDPsocket and TCPsocket types.
After calling SDLNet_CheckSockets, if this socket is in SDLNet_SocketSet used, the ready will be set according to activity on the socket. This is the only real use for this type, as it doesn't help you know what type of socket it is.
3.6 Socket Sets, 4.2 TCPsocket, 4.3 UDPsocket