Hello,

I'm looking for a window manager or a desktop that supports
real transparency ...
In fact I like fvwm because I can modify it as I want but when
there is something under a transprent window I do not see it ...
I just see the transparency made with the wallpaper : the window
under is just hidden.

When I used Xfce I was able to use such a thing without any problems (composite option). But I don't know what desktop/wm
support now real transparency, and it's not easy to find such information on google....

Can you help me ?

thanks,

you can use compiz

Indeed, but it only works for KDE/Gnome I think

I've found something interesting : xcompmgr and transset-df.
Theses two tools help to get transparent windows, you just have to
add that line : Option "composite "Enable" into the xorg.conf file and it works fine (in order to speed up everything you have to add several other lines , see : http://fluxbox-wiki.org/index.php/Transparency )

I don't know if it's the best way to resolve "my problem"
but theses tools seem powerful.

You can use compiz with xfce or even standalone. I use compiz with just the xfce panels.

Not true; there are distros out there that package compiz with XFCE. The trick is to check out the list of requirements to support compiz features and see which ones your graphics card supports. For example, don't expect any transparency at all if your graphics card doesn't have an 'alpha' channel.

I tried to install XFce with Compiz but it never works ....
Have you a documentation that could help me to use Compiz with XFce ?

http://ubuntuforums.org/showthread.php?t=203877

https://help.ubuntu.com/community/CompositeManager/Xgl

thanks you,