Topic: Fireface 800 and other RME devices cascade

Hello!
Yes, I read a lot BUT still have questions, tell me please if I'm right or not:
1) Can I connect FF800 + multiface 2 by firewire cable? I suppose I can't, but want the answer
2) Can I connect FF800 + FF400 by firewire cable? Think so
3) Can I connect FF800 + UFX / UCX by firewire cable? No ideas

And generally, which restrictions I will have, when I cascading FF cards by FW? For example when connecting two FF800 cards, coud I use full resolution for all channels of both cards including ADAT's and SPDIF's ?

Thank you!