pseudostereo

Is there any way to have 2 cameras in a scene, each rendering to their own window?

In the attached patcher, I'm rendering two cameras to a single window (positioning them via viewport), and then sharing the context to put each view into its own window, but then I can't interact with the scene - and I'm limited to the resolution of the original context.

Really, what I'd like is for the two individual windows to be full-resolution & interactive, with the combined window as a preview; basically the opposite of what I have now.

Is there any way to have 2 cameras in a scene, each rendering to their own window? 

In the attached patcher,  I'm rendering two cameras to a single window (positioning them via viewport), and then sharing the context to put each view into its own window, but then I can't interact with the scene - and I'm limited to the resolution of the original context.

2 cameras with 2 windows - possible?