Dual-Viewport?

yes, but i want it (like in unity) to get the viewport and the sceneeditor displaying the same game parallel.
In one viewport i want to see the game from my main camera. In the other i want to fly around and select thigs, or just watch from an other angle.

Is this possible? When i start in a new Window, in the main viewport i cant see anything moving, or spawning.

greetings
ganymoe