I have a Comcast DVR and would like to hook another one up to the same TV. This seems simple enough...just split the cable and set up the second just like the first.

Here is my question. How would you toggle back and forth between the two DVR's? Each DVR would be connected to an HDTV via seperate HDMI cables.  I've called Comcast several times and have been told the following:

1. You would use the input button on the remote ( doesn't seem likely to me).

2. You would use a seperate remote for each DVR. Ok, but what's going to stop one remote from accessing the DVR that you do not want to view?

3. Comcast does not support this kind of hookup and would not install it to begin with.

I would like to be able to record 2 or even 3 programs at one time and still have a tuner left for watching.

So can this be done, and if not, what other alternatives would give me more than two tuners to work with?