Rex:
I am not sure but I doubt you can build or buy a HTPC that you can then use to access your HD DVRs. There may be some third party software that allows you to do this but I have never heard of any. The only way, that I know of, is to build or buy 2 or 3 HTPCs and network them together to replace your HD DVRs. Then drop your HD DVRs, get a regular digital cable box and use the HTPC to control them.
I am not sure but I doubt you can build or buy a HTPC that you can then use to access your HD DVRs. There may be some third party software that allows you to do this but I have never heard of any. The only way, that I know of, is to build or buy 2 or 3 HTPCs and network them together to replace your HD DVRs. Then drop your HD DVRs, get a regular digital cable box and use the HTPC to control them.