GNet Tips and TGNetObject network usage

When I change something using SetGNetFloat etc on a TGNetObject, does it resend every field in the whole object, or just the one I changed?

Is it a viable strategy to have some fields in TGNetObjects that are being constantly set, while most are not? Or will that result in resending all 32 slots every update?

Thanks

Also, please give me any GNet tips you have! I want to make some multiplayer stuff!

I've just started messing about with Gnet myself and really like it. I get the impression that most people are using alternatives like BNet, but if GNet is fast enough for me then I'd like to stick with it. An uptodate tutorial would be most appreciated though!

One thing i'd like to know is, is it possible to get the ip address of a GNet host?