What Are The Panel Types?

Hello,

I'd like to know if there is a visible render view in the GUI.

As I am not supposed to know the name of the window (?), I want to list all the panels which are render views.

So I intend to use the getPanel command with the -type switch.

But how could I know the list of the panel types ?? Especially the one concerning the render view...

Thanks.

getPanel -allTypes ;