Don't understand cams

I know there was a lot that got frustrated, including the OP, with the heavy debate between YR and other. BUT! When someone decides, to do a search, and sees a title "
Don't understand cams
Someone who wants to understand cam better, THIS, WILL BE A THREAD WORTH CLICKING ON.
There was a lot of good, DEEP, information that was brought out. On how a cam works and why! For those that were/are interested, this IS a great thread.
There was several post that i printed off so that i could read a few more time to get the whole picture. There was vary good info and links, in this thread for those that wanted to learn.