C5, CI, MVC

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Hi

I'm new to C5 but I've seen few videos from Andrew and looked at the doc for developers. I like the simplicity of extending the front-end but my questions are more about the back-end.

- I have MVC code, what is the best way to integrate it into C5 ?
- C5 use ZF, may I add CodeIgniter as 3rd party library ? How to effectively communicate between CI & C5 ?
- lastly (not relevant with the above, just curious) : What software they use for their Forum ?

many thanks