Hi Gilad D,
The PDF will be saved on a server, so it can be accessed by everyone. ALternatively I think we could get away with having a copy on each machine, and for each machine/user can have a different prefix. The only other issue I can think of is whether this can be done on iPad as well.
I just keep thinking there has to be a easy solution to this, carbon copy books are essential to a lot of businesses so there should now be a digital alternative.