You can link all the RM433's together so any remote can talk to any processor. We did this on the project I showed pictures of the Time speakers in. Everything can talk to everything. This is a 6k sq ft. 3 story house. I have one RM433 on the top floor where the bedrooms are, 2 on the middle floor where the family and living room are, and one in the rack area on the lower level. I think there are 6 RP-6's on the project running the show...
We have 10 or so wired touchpanels and I can do a global off which will shut down the whole house this way. All connected via cat5. Some with phone line and/or Ethernet on the same cable. We did not do the prewire so we had to get very creative here... lol