I got hooked on X10 by a good friend who was already a X10 user in the middle 1980's. My first interface was a CP290 and the software was a DOS version. When Windows 311 came around, I got Windows software that was custom made and you could use your own icons for modules. When Windows 95 was released, I got Active Home software and the CM11 serial interface, kept that through Windows 98. When I got Windows XP Home in 2005, my motherboard at the time was one that played the "vanishing act" with COM ports, where Active Home couldn't find the CM11 and suddenly could see it, so I got Active Home Pro and the C15A USB interface, which 5 years later I still have.