>Having run some small tests with VFP and VSS I have found you cannot have the
>project files open twice (at least I think that's the case!)

Nope, not the case. :-) You have to enable multiple checkouts, and remember to Update Project regularly, but it works well.

You probably want to order Ted Roche's VSS book from Hentzenwerke, even if you don't use it for this project.