How to set focus on only one window?

Say, I have a main window with a button inside, and if the user presses on that button, another warning window with an OK button inside will then pop up. Now the question is how can I disallow the user from returning back to the main window unless the OK button on the pop-up window is pressed ?

What is a modal dialog? Appreciate if a simple example could be given to illustrate how it works. Thanx!

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