Currently just contains the Arduino library for writing Hummingbird Duo Arduino Programs. Learn more about the library from the Hummingbird Arduino API Description, or visit the Duo's Arduino tutorial at: http://www.hummingbirdkit.com/learning/arduino-programming
The Hummingbird folder contains the library and example files.
A simple way to install everything needed by running a single program can be found at: http://www.hummingbirdkit.com/learning/setting-arduino-environment-hummingbird-duo