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Re:Vintage video game cartridges with built-in modems by Symbiote on Sunday June 30, 2019 @07:46AM (#20317714)
That's also how the auxiliary content in digital TV works -- the content that isn't video, audio or subtitles.

The channel guide and semi-interactive text content (i.e. "modern" teletext) are special packets in the MPEG stream, and are cached by the receiver.

Re:Vintage video game cartridges with built-in modems by izacus on Sunday June 30, 2019 @10:01AM (#20318228)
Yep, and the MPEG streams in Europe still carry actual Teletext on some DVB-T/C streams and even IP-TV.