I think the real technical limitation is performance. An extra window means 
more memory usage (for backing stores), more CPU and/or GPU processing (for 
compositing backing stores), and more power consumption (shorter battery life).

You also have to be a bit careful about going your own way on this. Users who 
perceive a behavioral difference in your app may well be confused or irritated 
by it. Users who don’t perceive it may not get any value out of it.

> On Feb 15, 2015, at 06:13 , Charles Jenkins <cejw...@gmail.com> wrote:
> 
> Is this possible, do you think, to open a window that always hides directly 
> behind the working window?      



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