Thanks for replying. Yes, it was the default. If you go to rc.d and then rc.X KDM is the one you find given as the default login manager.
For some reason though it didn't work; my login took me straight to KDE without an option being given. I only switched to VASM as a result of not having any prior options.
Anyway, I've got Fluxbox working in SOHO now, though it took a bit of manual configuration; I changed the last line of .xinitrc to "exec /usr/bin/startfluxbox".
All's well that ends well.