Set DTR-Bit under Windows NT 4.0

I want to set the DTR-Bit of the serial port COM1. The running os is NT 4.0, and I want to use Visual C++ 4.2. How can I solve this problem ? _outp doesn`t work. If you have some sample code I will be very happy. Thanks.
elio071697Asked:
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chensuCommented:
Use Win32 Communication Functions. There is a Win32 sample: COMM: Demonstrates the Communications APIs that comes with Visual C++ 4.2.
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