How do I make a simple video with my computer"s web cam?

I recently (10 mins ago) asked a straightforward question on how do I make a video.  For five of the most wonderful years of my life I designed Critical Path Systems for Launch Pads 39A&B, The Vehicle Assembly Building and the Crawler that took the candle out to the pad.  A Critical Path System told on paper how to engineer, design, and build a structure.  In this case, it involved app. 3400 separate activities and when and how and how long those activities were relevant to one another.  At the time the co.  I worked for and which had been awarded those contracts, had developed the Critical Path Method as a result of the guidance system of the Polaris Missile which was incredibly hard to get a handle on.  By the time the Apollo Manned Lunar Mission was implemented, I was one of only ten people in the world who knew the process.  We required honest, short answers to our questions or it would take years to accomplish what Stephen Hawking characterized as "the greatest single accomplishment in the history of man"  If I had been given answers to my questions by those "engineers" for Microsoft on how to use a web cam and had implemented them, there wouldn't have been a second Apollo Launch, because the first three astronauts would be dead.  How do I make a simple video with my computer"s web cam?     Al Wood