What windows are "popup windows"?

[John Found]

On Tue, 17 Nov 2015 20:08:42 +0100
killermoehre <killermoehre at gmx.net> wrote:

> The shadow is a property of the window decoration. No decoraton → no shadow.

But then how to make popup windows without override_redirect? 

In addition, after some more experiments I found out that the option 
"Opacity of popup windows" actually works with my popup windows and
I can make them partially transparent this way. 

Curiouser and curiouser!

Regards
-- 
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John Found <johnfound at asm32.info>