I'm not new to SE, but new to here. This question is closed as unclear, and well, I agree with that. The question comes from my poor memory, so although I have tried my best, it cannot contain enough information to make it clearer (it even couldn't help me google by myself). The answers provide good information, but I'm looking for an answer that specifies on the UX of the controller. Therefore I want to improve this to reopen the question.
One more thing. After the edit, the title is less clear than it used to be. Because the editor is PearsonArtPhoto, I think I have an ignorance. Can you explain me why?