[Wine] Integrating a dual boot system

[Hairyloon]

After a succession of failed attempts spread over a few years, I have finally got a Linux installation that does nearly everything I need it to.
I've also got Wine working on at least a few things.

However there are occasions when I want to dip back into Windoze, and so I've got a dual boot system, which is OK, but it could be a heck of a lot better.

The relevant points are: WINE runs on its own virtual C drive, and Windoze runs on the actual C drive.  Can I get them both to use the same, so that if I install a programme on one, it will work on the other (some work fine wherever, but some do registry changes or something). 
The other thing is internet & email.  I use Firefox on both, can I set it up so that if I bookmark a page on one, it will be bookmarked on the other?