If you have a DirecTV Receiver with TiVo, it has two tuners, so you can record two shows at one time and watch a third, pre-recorded show. You can do this also with the non-TiVo DVRs from D* and also from most cable providers and, of course, E* (Dish).
To record two different channels from D* at the same time requires one of the above or two separate receivers. There is no way to record two channels without two tuners of one description or another.
To record two different channels from D* at the same time requires one of the above or two separate receivers. There is no way to record two channels without two tuners of one description or another.