TTX ->
http://patent.tange.dk/ziki/EP/7/3/EP732026.html
"In such multiservice communication systems, it is desirable to provide a teletext (sometimes referred to herein as "TTX") system. TTX systems included in the broader communication system may accomplish several functions. The TTX system may provide support to facilitate operation of the decoder by the subscriber. Such support may take the form of menu pages, help pages, and/or program guides. In addition, the TTX system should supply TTX services per se, such as stock reports, weather reports, and news. Furthermore, the TTX system should provide support for individual services included in the multiplexed signal. For example, TTX support can facilitate impulse pay-per-view (IPPV) purchases of television services or provide the current program name for television or radio services."
