I have this big problem: i don't have a webcam, so i use a virtual one based on camtasia that let's u capture a portion of the desktop and make it as a live video (sorry 4 my bad english, i'm italian).
The point is: some video application, like netmeeting, lets u choose the video source for live broadcasting, but MSN Messenger uses the first and/or default one. In my case it's a tv car...

How can i change this and make Messenger use my particular device as a webcam?
Tnx