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How do I connect two video cameras to my computer have them both show up on the desktop at the same time so I can see and capture both images using a screen capture program?

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I am a teacher and want to make some videos to post online for my class.  I would like to have it set up so that I have a powerpoint presentation going, a video camera pointing at a piece of paper I can write on and another video camera pointing at me.  How do I do this?  I have seen several solutions but they seem to be for switching between videos whereas I want both video images to be on at the same time.
Also, is there a screen capture program you would recommend?
The best answer: Go to System Preferences - Sharing and change the computer name there. You can also, optionally, change the name of your hard drive to further clarify the origin of your backups. Click once on the "Macintosh HD" on your desktop, then click its name to allow you to edit it.