In times of team-, co- or cloud-working, it would be a great step ahead if two or more people could work on one document simultaneously - without a plug-in or any other additional detour. That's our dream over here.
I'm not talking about book chapters or the like, I'm talking about one single file. Luckily I'm not a programmer so it is easy for me to describe the basics: 1. A file can be opened by several people 2. Working on one page or spread locks it for other coworkers 3. Saving is blocked and put in queue when a coworker is saving at the very moment 4. Don't forget a communication channel inside the publisher.......just kidding!.......or maybe not?
There are lots of little problems that occur in my mind (e.g. page organization) when thinking about such a feature......but hey!....first of all: it is where things are going to evolve to anyway. So why not be part of it?