The thing to remember with Bryce Lighteneing and networking is that you're probably using newer processers in conjunction with older slower ones. While you're using a screamer in the Ghz speeds now, that old clunker you're networked to is probably working at Mhz speeds. This actually CAN increase the time taken to do a render. Once you get past that, the problem of having your main machine render as well as the networked machines is a simple matter of actually clicking that little checkbox that says "Use Host To Render" Under your network render settings.