Which program or process is using ManyCam?

I closed all the video windows, and ManyCam is still going on broadcasting. I changed the camera source to a different camera and it was still broadcasting (Usually when I press the close button, it stops broadcasting unless there is a video window open).
How can I find out which program or process is using it?

Then I won't be able to see which process was using it. If there is a backdoor in one of my programs or firewall settings, or anywhere on my computer, I would like to see it.