We have Linux, Mac, Windows, Android,..
We have kids that know more about PC's then parents.
Your suggestion can only work with systems that are heavily locked down and always controlled by the parents.
That is not the world in that we live. "Just 3 buttons" is a very naive idea to a very complex problem
But feel free, design a 3 button system, including client/server communication and more. Than we can talk about it