television on internet

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How do you capture video of television or internet activity without pointing a camera at the screen?
I want to start vlogging (video blogging) advice on a website I’m active on, but I don’t know a lot about technology. On Youtube, I often see that people have clear, crisp video of their internet or T.V./gaming activity. How do they do that? The only thing I know how to do is point to camera at the screen and that just looks awful. All I have is a digital camera and Windows.
Game Recording is Done by Say ‘Fraps’ On a PC.
http://www.winmatrix.com/forums/index.php?/topic/20530-best-screengame-recorder/
Screen Recording is done by say.. Camstudio / Hypercam / Camtasia…
http://www.webresourcesdepot.com/10-free-screen-recording-softwares-for-creating-attractive-screencasts/
Hope it helps
