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An AP Interface, is the way for the programmer to act as the User of this Interface. It IS a user interface.

What should be taken seriously is proper domain and service modeling. The rest follows.

A good UI follows a good model. Visuals and trends are just a tiny bit.

There's a massive difference between a back button and gl.texParameterf().

I honestly have no idea what "proper domain and service modeling" means but a good UI is NOT a natural consequence of good engineering. That's why human interface design is a real discipline.

A back button is a GRAPHICAL User Interface.

Code/APIs are a different type of User Interface. Maybe we can call it PUI for Programmer User Interface.

No one said a back button isn't a user interface, the person you replied to just said that they were very different.

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