The Samsung D* boxes will show local channel program info (provided by D*), IF connected to a D* satellite dish. This includes all local OTA analog and digital channels, and all sub channels a digital station is broadcasting.
If the Samsung D* box is not connected to a D* satellite dish, it will show digital channel program guide info provided by the station via PSIP data. If the station is too lazy to add program info or correct PSIP info, you will get little more than the station's call letters and sub-channel number(s).
Results vary with other brands of D* HD boxes.