On Fri, 4 Sep 2009, Thomas Adam wrote:
2009/9/4 Lucio Chiappetti <lu...@lambrate.inaf.it>:

 - associate to an application (which could be a do-nothing application
   e.g. an xterm with a special title never opened, always iconized)
   an icon which is partially transparent (say a large red ellipse with
   the interior transparent)

No -- applications define for themselves the icon to use.  This is
sometimes changeable via ~/.Xdefaults by perhaps issuing a new PCF to
use.  Depends on the application though.

Hmm ... a bit surprised by this reply. I have in my .fvwmrc a few Style commands which bind an xpm file to an application or instance, e.g.

 Style Pine  Icon mail1.xpm

where in this case "Pine" is an urxvt started as Test (Init) Exec urxvt -name Pine ...

so I suppose I'm able to define a dummy application (I thought of some terminal window with a specific name which I will never open) and associate an icon to it.

I was more concerned with : which sort of file should I use as icon in order for it to be partially transparent ? The only trasparent things I used (and I guess I'll have to look back in my notes) are transparent GIFs.

--
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Lucio Chiappetti - INAF/IASF - via Bassini 15 - I-20133 Milano (Italy)
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