Conceptually it is very simple. Integrating it with existing tools is where the real work is. Ideally, I think you'd want it integrated with your text editor an

Conceptually it is very simple. Integrating it with existing tools is where the real work is. Ideally, I think you'd want it integrated with your text editor and it should be useful not only for code, but more general composition (I'm thinking scientific literature) as well. Of course, getting this to work in real-time with your collaborators is probably the holy grail and has been implemented to some extent over the years in quite a few products.