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The NetBIOS HANGUP command provides an orderly shutdown of a session. The XTI function t_sndrel provides a similar mechanism over transport providers that support connection-oriented service with orderly release.
If the transport provider does not support orderly release, you must call t_snddis to terminate a session. In this case, pending send and receive data may be lost. Set the call parameter to NULL, because NetBIOS providers do not support the sending of user data as part of a disconnect request.