Is it possible to change the transparency of all windows ?

[XPcentric]

Such that I can see the desktop background. Even if I have to install an app

 

[RedCroissant]

Such that I can see the desktop background. Even if I have to install an app

Hello, yes there is. The app is called Afloat.

I don't know if it works on all applications and in all windows, but it certainly works in Safari, Textedit, Terminal, Mail(most actual OS X apps). It does not work however in iTunes, iPhoto, or Firefox. I haven't checked others yet.

 

[XPcentric]

many thanks, I used this application long time ago for a short while, but how was I supposed to remember the name or to find it again?! Most simple was to ask on the forum. Except that it was available for 10.5.8, I'll just have to find older version of the app.