Internet Direct (Indy) Version 9.0.1 Beta
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property HandleAllocated: Boolean;
HandleAlocated is True when a valid socket descriptor has been created in AllocateSocket or Accept. HandleAllocated is False when a socket descriptor has not been selected, or the value of Handle is Id_INVALID_SOCKET.
HandleAllocated is used to allow sockets, altered using SetSockOpt, to indicate that the socket handle is no longer available for send and receive operations.