No, what i see was on full screen, not only windows transparency, it was removing the chat windows and puting only text at the bottom of the screen... so you could see what your friend was writing when you had an other things on you screen in foreground. (it's hard to explain... i'm french ! lol)
I think he had just a bar on the down of the screen and all was transparency so he could clic through the translarency line of chat to use his computer buring this time !
It's like if it was only the 1 line to write with the size of a status bar and 1/3 of the screen in transparency with chat line.
What a draw ?