Unbuffred serial Communication with Win32

I am trying to set the parity bit to define if it is a data or control byte to rx or tx. What goes wrong is that the buffering makes it impossible. When I change parity it will not affect the bytes because they are in a buffer. How can I do unbuffred serial communication in VC++ 5.0 ?
kalleballeAsked:
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vinniewConnect With a Mentor Commented:
You're not asking for much are you?

You need to go lower level than the Win32 API's to do that.

You'll have to access the comm.drv driver directly.  I think that there are examples in the DDK.

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kalleballeAuthor Commented:
No problem to bypass the problem by accessing the registers directly (by using Tinyport in NT). But I thought this ordernary task was possible using API function calls.
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