Apple Logic Pro /LogicExpress Discussion

Hi List. I'm just finishing setting up full Logic on a new (well  
Certified Reconditioned) 8 core Mac Pro.

I noticed in the Logic manual that a G5 or Intel processor are  
requirements for node machines. I thought when I looked at the specs  
on the Apple site some time ago that my G4 1GHz Powerbook could act as  
a node.

Has Logic 8 changed this requirement?

Having said that we have another couple of machines on our network, a  
Core Duo Mini and a G5 Powermac that could act as Nodes, currently  
only networked wirelessly.

Can anyone recommend the simplest way of networking three machines via  
Ethernet without having to understand the black art of networking??

The Mac Pro does have two Ethernet channels but one will be taken up  
with internet connection (no wireless onboard)

Thanks

Jon