How is DSR toggled programmatically?

I am new to this, so excuse me if I sound ignorant ...

How can DSR signal be asserted/deasserted on serial port programmatically using Win32 API's? I know that EscapeCommFunction() can be used to assert/deassert DTR... Does asserting DTR implicitly deassert DSR? Is this how DSR state is toggled?

Thanks,
Ruchika

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