You can automate GUIs using accessibility controls and/or desktop message bus. If an app is modular, as it should be, it does not matter one bit how many UIs it

You can automate GUIs using accessibility controls and/or desktop message bus. If an app is modular, as it should be, it does not matter one bit how many UIs it exposes. Also all CLIs are not the same — try automating ncurses application.