Implementing interface? What should the application process (something?) in this 3D enviroment and what would be the result? Really not understand

Now i'm not sure, but i'm thinking your request is rather simple only explained in a way that lets the brain work harder. If you've meant to ask if it's possible to create a 3D world representing a particular situation with moving/changing 3d parts processed by the application, then the answer is: Yes you can!
If you meant to ask with 'expert' help to learn how to start with Gamestudio, i'd recommend George Pirvu's wonderful Acknex User Magazines and workshops. Those teach you the first steps and moreover making it easier to understand the rest of the manual.
Anyways maybe i've got it all wrong. If so, please explain what kind of interface you're planning to implement. Which situation you'd like to be processed by the application and finally show the results lively in the 3D scene.