In case the meaning of that's still unclear, don't forget that the manual is here:
Manual
Reference Card
I've also found this helpful - it also explains a bit about the multi-player modes:
Unofficial Guide
[ed]
I haven't found any problems with Mac/PC inter-operability so far (in multi-player).
Page Eight..? I only have 5 pages for this thread... Guess I have my forum preferences set up differently.