If I have a Dell XPS 410 with the capablities of having Composite Video, and an NVIDIA Gefoce LE7300...?

As the Title States, I have a dell XPS 410 with the capabilities of having Composite Video directly from the monitor. I have an NVIDIA Geforce 7300 LE Video Card. How do i Record the composite video or use it as a webcam?|||If you do not have the user's manual, please contact Dell technical support. Seems to be a Dell specific utility.