Lightning is a seperate little program that you put on the other computers to set-up a network render, it comes with Bryce. You run Bryce on the main computer and lightning on the others and enter the other computer IP addresses in the main Bryce program by selecting "render animation". You can do a zero frame animation render for stills. I don't have a dual processor system but from people who have (you can search the forum) they said Bryce only uses 1 processor but if you run Bryce and lightning on the same machine it uses both processors. I'd suggest finiding a dual processor machine to test this out. Otherwise a renderfarm is the way to go except I don't think Poser network renders.