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"We [science fiction writers] always wanted to believe in "private sector" space -- hucksters make better characters than a government does."
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I'm wondering if this is the first place anyone described the idea that has finally been implemented on PC television cards. With these cards in your PC, you can not only watch the program on your PC screen and capture (save) programs and screens, but you can put in keywords, and let the PC screen current program subtitles.
Heinlein's version is somewhat more advanced, since it apparently looked for spoken words based on text criteria.
Also, note that some units (although not this one) are equipped with scramblers to remove commercial messages. It seems able to put a broadcast on "hold", suggesting that it has a Tivo-like capability to pause in presenting information while continuing to record:
"Can't we scramble that commercial?" suggested Lazarus. His companion peered at the control panel. "Doesn't seem to be equipped for it."
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