You can download it at www.legomindstorms.com. Just click look for RCX SDK. "Matt McDevitt" <maktos@maktos.com> wrote in message news:Furpv7.JMH@lugnet.com... (...) (25 years ago, 18-May-00, to lugnet.robotics, lugnet.robotics.rcx.legos, lugnet.robotics.rcx.nqc)