I think I'm confused about dualstack. Does it actually turn the two screens into a single vertical screen?

[keenerb]

I enabled dualstack for firefox and that's what it seemed to do, a single firefox window spanning both screens.

I enabled it for Magic Dosbox and it only uses a single screen.

Do I just have a fundamental misunderstanding on this feature?

[keenerb]

Ooooooh apparantly it works if I launch from the lower screen/special launcher rather than the upper screen google launcher thing. This is tremendous, I love it.