Function SocketFD_ISSET() Professional
Checks if a socket belongs to a descriptor set.
SocketFD_ISSET( <nSocket>, <nFDSet> ) --> lISSET
This is a numeric socket descriptor.
The numeric handle of a descriptor set previously created with SocketFDSetNew() must be passed for this parameter.
The function returns .T. (true) if the socket is a member of the descriptor set, otherwise .F. (false) is returned.
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