My users are not able to see if they are connected to the terminal server or it's the native os.
(Even if native os is win7 with aero; and remoted os is in 16-bit color, windows classic theme... I see that lots of times they are doing the wrong operations)
There is a program that can write a watermark or overlay an image on the screen?
So I could write on the screen "Yeah, you are on the terminal server" or "Oh noes, you are offline"