>- VSS installation OK
>- VFP's active source control ok
>- In VFp ; under file 'join Source control project'
>
>And now ? Can't get further ...
>
>Can anyone put me on the right track from here ?

Have you put any of your VFP projects in VSS? Under your Project menu, you have to "Add Project to Source Control..." first. Other users would then use the "Join Source Control Project" menu to get access to the "shared" project.