mouse-transparent windows

[Ferenc Gyurcsan]

Hi all,

Maybe somebody has done something similar before.
What I'm trying to accomplish is to create a window that does not accept mouse 
click events, but instead passes it to the windows under it (if any, of 
course). So, if a mouse event is received, the window should behave just like 
if it wasn't even there. 
This implementation is in Qt, but that's not really relevant, I'm suspecting 
that I'll have to write X code for this.
Can anybody provide some clues?

Thanks,
Ferenc