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The software architecture is the same as most robots in ROS: you have stacks, packages, and nodes. The hierarchy is like this:

Turtlebot Stack|(Stack)
               |-Turtlebot Teleop(Package)--------|- Keyboard teleop(node)
               |-Turtlebot Bringup                |-logitech teleop

All of the turtlebot code is in multiple github repositories here: https://github.com/turtlebot. If you are planning on porting the software to another robot, you might want to consider somehting like the arbotix drivers as they deal with a simpler protocol as the turtlebot uses the Kobuki base protocol. Hope that helps,