Well, if you want the second tab to fetch the text from the first tab (instead of getting it from the server), send the text to the second tab composite while you upload the text from first tab to server. That way it is cleaner. Define certain interface for second tab composite to take text inputs. You can easily get the component sitting in each tab as well. So sending data from one tab to another tab, shouldn't be a problem.
Beware the other head of science - it bites! Nibble on this message: