Mark Hobley wrote:
> I try to start it from a terminal window:
>
> jwm
>
> This gives an error:
>
> JWM: error: display is already managed
>
> Why is my /etc/rc.conf not changing the default window manager?

I think rc.conf is for XDM. If you're not using XDM (or KDM), you need
to start jwm in your ~/.xinitrc. In my KDE system, I've put "startkde"
in there. In your case, use the command that starts jwm.