Hi - popup window vs top_level window

["Dafna Hirschfeld" <dafna3 gmail com>]

On my main window I want to have an advanced button that when clicked, it opens a new window with advanced options.
From what I understood, GtkDialog is used only for small amount of input so it's not suitable for advanced window.
So now I wander whether I have to use a popup window or a top_level window, I didn't really get the difference between them.