I'm new to wine, looking into serial communications. I have a failing scenario in a application, and I'd like to write a conformance test to demonstrate/document the issue. I looked in dlls/ntdll/tests but did not see any serial port related tests - did I miss them or do none exist yet? Assuming none exist, a very useful tool would be a serial port loopback device. Rather than require conformance testers to attach a hardware loopback device (NULL modem) to a physical port, could we create some virtual ports in wine and connect them together? Maybe com98 and com99 for example? Anything written to one of the ports would be sent to the other one. On Windows this can be done with a device driver, one example is com0com (http://com0com.sourceforge.net/). Is this a reasonable approach? Thanks, Chris