21.   The shows are listed in a monthly program guide that is sent with all QVC purchases.

22.   The two companies had been exploring a plan to offer interactive program guides for cable television.

23.   To use the electronic program guide, however, owners will have to install a tuner card that allows a personal computer to serve as a television receiver.

24.   Tribune also has stakes in the on-line service America Online, in the electronic payment company Checkfree and in Starsight Telecast, which produces an electronic television program guide.

25.   Viewers are advised to keep those program guides handy.

26.   With all of these features to play with, though, there is the distinct possibility that the program guide will become more involving than the programming itself.

27.   Digital video recorders now automatically call a central office to get updated program guides.

28.   The company said it would use the box to offer enhanced, digital pay-per-view channels, as well as new program menus and an interactive program guide.