I need to use a serial port in my program and I found what looks like a really nifty library for Qt called "QExtSerialPort." I downloaded the latest version off sourceforge, built the project, and copied "qextserialportd.dll" over to my project directory. I've never used a DLL before, though, and I'm not sure how to proceed. How do I add it to my project so that I can use the classes inside it?

Thanks for your help!