OK................. I think I might've finally got it! I had been using

remember

from habit, because of simple examples I've been building on, and my simple app had been able to handle that obviously! I've now got things working I think, using just

var dataIn = mutableStateOf("")

for example, and my @Composables seem to be updating live when it changes???? Hopefully this is right! Gee, what a learning experience. Thanks anyway!!

And the

remember

idea might help me with another problem I was having, where I wanted a variable to be set/copied from another variable, but then remain unchanged as the original one varied!!? Wow. Good stuff. @darkmoon_uk will be proud of me, if I can get this into my head! This might've been worth staying up late for, if I can have learnt this!!!