Day 2 Keynote Presentation

Suggestion: Window management on both devices. Is there an easier way of moving windows from Phone to PC and back and fourth? I noticed you had to click on the big screen to move the app from Phone. it seems like there should be an easier way of doing this.
Question: Can UWA only run one instance? So I cannot have the same app running on the Phone AND PC?
Is there a reason why the breakpoint of 768 is being used here and 720 is used in all the other build presentations?
How does the app know it's operating via continuum? Does the device family change or are there other APIs that need to be observed?
This presentation didn't address apps that don't naturally scale onto a large screen.
Is there a way to opt out of continuum? Or should we not write apps that are optimised for the mobile experience because they won't scale nicely onto large displays?