In fact this was the one facility I tried to find in rox because it would indeed be useful to open two rox windows - which is often what I do.in Xfe I have the 2 file-panels always at the same position, and can navigate very fast using the tree on the left.
I have a feeling it is the sort of thing that can be configured (with extra scripting)
It seems others might have similar requirements and so this will be very useful to them . . .
Thanks again