How do you sync locations in books between devices?

I have Digital Editions installed and authorised on both my laptop and desktop and I can download sync and read books from my local library with no problems - What I would like to be able to do is to sync the actual page location to whichever device has the lowest page number.

for example on desktop i am up to page 20 and on laptop I am on page 10 - I want the laptop to be up to page 20 next time I start Digital Editions and if I read on the laptop I want the latest page I get up to synced to my desktop as well...