What he is refering to is TV Guide On Screen data. Its a closed standard, the protocol was written by GEMSTAR and SONY, Mitsubishi, and others licensed it, while GEMSTAR gave tv stations the equipment to install at their stations, pretty much one station in each market, thats all you need for complete coverage. It is passed through to TVs and DVRs (non-TIVOs) through analog and digital tv stations, right along side closed caption data. All major markets have free guide data being transmitted via over the air analog or now digital on some CBS and PBS stations which includes all the data going out 14 days for all the tv stations, THIS IS SEPERATE FROM PSIP DATA AND NOT MANDATORY, but its so widespread it may as well be a standard, it takes about 1 week to get enough data to have a complete guide, unlike say TIVO or your cable company which take seconds, when you turn off your device at night it switches over to the channel in your market that contains that data and starts downloading, the protocol is very good though, even on a OTA station with lots of static, the data manages to get through. Gemstar owns the patent, all the major markets have it and non-TIVO DVRs rely on it for their program guides, it has NOTHING to do with Cable Cards, that guide data, different from PSIP is free and available in the clear and even over the air, here are all the details: http://www.crutchfieldadvisor.com/S-jqyleDfUqOQ/learningcenter/home/tvgos2.html If you ever wondered how SONY and LG DVRs get their guide data without have to be hooked up to the internet, or dial some phone number, now you know. Its actually pretty decent, its not Tivo good, but you also don't have to pay for it. Its not like PSIP data which FCC regulates, it just happens to be very widespread, if you don't have a TV Guide On Screen compatible device you prob never heard of it. Its got some neat features, like if you record an analog tv station to VCR, then play it back you can still extract the TVGOS data, just like you can play back the Closed Caption (CC) data on a VCR, there are some advantages to this like capturing a firmware update on VCR tape and giving your buddy the tape, ok Im getting way too indepth, go check out the SONY HD DVR thread at AVS those guys are masters of TVGOS data hacks.