Feature for Managing Multiple Simultaneous Book Viewers ?

When reading on my PC, I'd like to have something that can track multiple calibre viewers, each potentially open on a different book, and each at a different location within it's book. The idea is to be able to close all the viewer windows at once, and subsequently re-open them all at the same book(s)/positions on demand.

Sort of like the Session Manager functionality in Firefox.

Does anything like this already exist ?


-- Swen