Hello, I was reading Faster, Smarter A+ by Drew Bird published 2004. He says that ECP is "2-way simultaneous Full Duplex..." while EPP is half-duplex. I've read other books that refer to ECP & EPP as both half-duplex. Does anyone know if ECP (Extended Capabilities Port) is full or half duplex? I hate it when my reference sources contradict each other. Thanks, DigitalSierra