I want to know the answer to the following question:
Sky HD's set-top box, TiVo's Series 3, and Dish Network's VIP 622 are examples of what?
All the background I'm provided with is that "Some cable boxes are capable of receiving or recording two or more broadcasts at a time in HDTV format, and HDTV programming, some included in the monthly cable service subscription price, some for an additional fee, can be played back with the cable company's on-demand feature.". Is that enough to answer the question?