Flow control and DCB structure

Windows HyperTerminal COM port settings dialog contains Flow Control combo with the following values: Xon/Xoff, H开发者_开发问答ardware, None.

How these values are related to DCB structure? I don't see any member in this structure that I can fill with these values.

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Xon/Xoff: fTXContinueOnXoff, fOutX, fInX, XonLim, XoffLim, XonChar, XoffChar

Hardware: fOutxCtsFlow, fOutxDsrFlow, fDtrControl, fDsrSensitivity, fRtsControl