Unfortunately no. You need a TV in to make it work
= Can you use your Sony CyberShot DSC p200 as a web cam?" =
no
If Sony Cybershot DSC-S700 has a real-time mode - you can use it as web cam /for sure/.
yes
Sony's Cybershot series are the perfect choice for your daughter as they are very easy to use and lightweight. Some newer models have touchscreens that make them even easier and faster to use.
Ballsagna
USB streaming may work, but is not a feature on the SONY HDR-XR500V. There have been rumors about a firewire port that connects to you computer then you can use it as a webcam possibly. From what I know, it cannot be used as a webcam.
A Sony Cybershot digital camera is a fantastic model of a camera by Sony. Cybershot is the model of camera that sony is most famous for. They are usually small profile cameras with incredible photo quality for their size.
The largest Memory Stick card you can use in your Sony Cybershot DSC P71 is 256MB http://www.mymemory.co.uk/compatible-memory/Digital_Cameras/Sony/Sony_Cybershot_DSC_P71
http://myforum.lasyk.net/showthread.php?t=33972
On my computer you use ArcSoft WebCam companion 2 which is under programs.
The Sony Eye cam is the only one that I've heard of that works