What is the difference between the two of them? When do I use which?

Also, can I do the following:

Create a window without alpha, paint some opaque content. 
At a later point use window->SetOptions(window, DWOP_ALPHACHANNEL).
Will the surface from GetSurface return a different surface then? Do I
need to release it and get it again?

Should I rather recreate the window?

regards

-- 
Qt Development Frameworks, Nokia, http://qt.nokia.com
Anders Bakken
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