Telefile is an RFID sticker that is machine readable. So, you can encode metadata onto the RFID sticker
that is automatically readable by the deck. Things like reel number, show, studio, date, etc.
THe problem is that most people have neither the encoder, the reader, or the option on the deck, so
except for some major network or studio libararies, most people never use the telefile capabilities. The cost per sticker is also relatively high. It's a great idea who's time may never come.
I give Sony a lot of credit for developing the system, but it really hasn't taken hold within the industry.