Shoutbox

I wonder what the bar is that I see on the centre of my monitor though...it seems to appear every time I do a video call in WLM, Skype and even in QQ International.
It has no function and clicking on it will bring it to the front, with no program being selected. It seems to serve no purpose but to show that a webcam is turned on. I can't turn it off, nor move it, nor do anything with it.
It's a white bar being centred in the main screen.