and the other thing erm which er er is good, supposing you're watching er a programme and there's a football match on and you're interested in the, the football  er but you don't really want to keep, you know, switching to find out what the score is, er i'm talking about teletext as opposed to a programme, you press the update and it w er and if something's happened, you know, they've changed and there's been a score, it'll come up er  er while you're watching the programme, er it'll let you know that erm there's been something happening.