GUI with two screens

[Sampletekk]

Sorry for all the newbie questions, but how do you make a GUI with two screens, so you can have one set of controllers on one screen, and another set on the other.
In KSP you would do this by makin a GUI that has twice the height as the visible and then choose what part to show

[bendurso]

@Sampletekk Showing and hiding panels (You place sliders or other things inside the panel, and then hide or show it). This is a tutorial from David: