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
[339 byte] By [Ruchika] at [2007-11-18 8:09:03]