location of discussion of lives

[leeoliveshackelford at surewest.net]

Good morning, dear FreeBSD enthusiast.  Can you help me to negotiate the FreeBSD website?  I am trying to find a general discussion about "livefs."   I have not been successful at entering the correct sequence of search terms to find a general discussion about this topic.  I would like to know what this feature does, and the situation in which a user would wish to install it.  My question would refer to either release 7 or release 8.  Thanks for any and all enlightenment.  Yours truly, Lee S.