I assume that you have read the tutorial for loading external from
a text file. If not then read the following tutorial first.Now lets see this line data.scroll--.
As you know data is our varialble which we are using to load external text.
So its easy to understand what is going on here. Secondly if your Dynamic Text Box is in any other movie for example you MovieClip() name is news then you will use it
like this news.data.scroll