How can I tell what the other tuners are watching? I want to be able to swap and keep two shows "recording" or at lease saving 30 minutes. I can only do that if the main TiVo is set to one of the channels I want to swap. I'm used to a 2-tuner TiVo on each tv and I just switched to one TiVo and 2 minis. Still trying to learn the tricks.