fdo: Translucent xterm?

[enkil]

After all the news about xgl I've taken a look at the freedesktop.org website and found this screenshot which shows a translucent xterm.
Does anybody know how to achive this kind of a transparent background for any terminal?
I use aterm/eterm which provides "pseudo" transparency, but the shown transparency in the screenshot is exactly what I was looking for.
As far as I'm informed about the composite-extension in x.org, "real" transparency can only be assigned on a per-window basis but not on a background?
I guess the screenshot would then show a xgl-xserver and a patched xterm? I read about transparency on freedesktop.org, they said that the xserver runs with a color-depth of 32bit (8bit red, 8bit green, 8bit blue, 8bit alpha). Would this mean, that you could make everything somehow translucent by assigning an alpha-value as a backgound-color?

[TheRAt]

Take a look @ this
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[enkil]

I am aware of xorg's composite-extension and how to use xcompmgr and transset (I think I do...). Problem is, you can e.g. make an xterm 100% transparent, but this will affect the whole window (including fonts) not only its background-image (correct me if I'm wrong!), what would be useless as I cannot see the terminal-fonts anymore as they are transparent, too
I want true background-transparency as shown in the screenshot that doesn't affect the font. I.e. I want a 100% "real" transparent background but keep the font 100% visible... If this is possible using xcompmgr/transset (IMHO it isn't), I didn't figure out how to do that...

[enkil]

http://freedesktop.org/~keithp/xterm-trans.tar.gz

Found the patched xterm... It uses the composite-extension. Too bad that the transparency is not documented somewhere...