Basics: When to use windows and views?
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You create a window, and inside the window you create many views.

Ok great, but how many windows do you create per app?

Say you have a login screen, register form screen (register screen has 3 page or views) and 1 dashboard screen.

So do you create....

1) 1 window (+many views) for login/register and 1 window for dashboard? 

or

2) 
1 Login window + Login View

1 Register window + RegisterScreenView1+RegisterScreenView2+RegisterScreenView3

1 Dashboard windows (+many views)