[mythtv-users] Two HD-PVR's and two stb's Is there a how to?

[Greg]

     I have 2 hdpvrs and 2 SA 4240 stb's..  Would anyone know of a how 
to for me to get this up and running? I have had one since they first 
came on the scene.. I change channels by Firewire.  My main question is 
how would I change channels on the second one?? I have googled trying to 
find any info,but I must not be using the right search terms..

Any help would be great...