Simple Composite app?

[Chris Debenham]

Does anyone have a very simple app that uses the new ARGB visual to make a
window with some bits transparent?
I've looked around at the small apps in cvs but haven't found anything
simple enough yet. I also gave my own attempt at it but it failed
miserably :-(
Basically I just want to:
* Create a window
* Make it transparent
* draw a opaque box on it
* draw a translucent box on it

Can this be done with pure xlib or do I also need cairo etc?

Thanks,
  Chris

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