Upgrade application from IP 3.4 to IPS 4.1

[Krzysztof Wiejak]

Hello, I have upgraded forum from v. 3.4 to v. 4.1. It works, but my private application doesn't works on new forum version. 
I want to upgrade my application to IPS v. 4.1. How can I do it? 
Where I can find instruction of creating new application on IPS 4.1, API, tutorials, directory structure or something what could help me to resolve my problem? 

[Dean_]

 

 

There is a Tutorials one to but I can't find it at the moment.