Two 9910 IR/RF Command Centers - How to isolate signals

[bpsherwo]

I'm not very optimistic about this one, but here's my problem.

I've got 2 matched brand TVs which utilize the same Device Codes in separate rooms.

I also have 2 9910 Command Centers (one per room)

When I turn on the TV in one room, it of course turns on the TV in the other room (first time I ran into a negative related to the RF Remotes)

Any ideas beyond preventing the repeated IR signal from reaching the TVs?