Thanks for the tips.
Doing what you say works fine on a Mac as long as you install the Wibu-Key Application, which Graphisoft seem to have forgotten to put on the installation disk. You can then set up your WkLAN server by IP address on port 22347, which is on the client tab, as long as you have set up this port on your firewall. See enclosed sample.
You can download the latest version from the Wibu website