QUESTION Part 1. As far as I know, when you edit a symbol, it affects all instances of the symbol within the current document open. Is there a way to have the changes affect other documents? Illustrator doesn't seem to let you import and save and update symbol libraries, as it just creates a new instance of the library when you open it in another doc.
QUESTION Part 2. The main reason I ask is, I am wireframing a responsive site in Illustrator. I want to be able to have a document for each page. I.e home.ai (this will contain multiple artboards of the various responosive sizes of the home page). So when I make a change in home.ai in say the footer via a symbol, I want the footer symbol to also change in about.ai or contact.ai without me manually having to change it. Is there a better way to do this?