Use the registry updater to prevent the PC from
allocating new com port numbers each time a
new machine is connected to the PC.
The registry entries must be run from the local drive of the machine.
Running the updater from a network source will not add the entries.
Remember to run the registry updater before pluggin in the first
Interface PCB (ie before installing the drivers). If you forget, you
can use the driver uninstall option from hardware manager, then run 
the updater and reinstall the drivers.
