Connecting Macbook to Widescreen External Monitor and using Split Screen

[mike__3]

I'd like to connect my Macbook Pro to an external monitor that splits the screen like this:

But when it's not connecting to an external monitor, it goes back to having a single program take up the entire screen.

Is there any app or setting that can automate this, so I don't have to spend 10 minutes configuring the windows every time I connect the external monitor?

 

[maflynn]

that splits the screen like this

That's just two programs that have had their windows resized. Its nothing more then someone manually configuring the windows that way.

 

[Samuelsan2001]

There is an app called split screen that will do all kinds of screen splitting for you.