About history.css and history.js

[teasers]

I want to learn how important enabling history function is.
What changes exactly if I disable this function and delete history.css and history.js?
I think this is about enabling a javascript "back" function in the browser. Assuming I am using only the horizontal.swf, do I really need this?

Thank you :-)

[RVC Video Chat]

http://livedocs.adobe.com/flex/3/html/help.html?content=deep_linking_2.html