In a viewpager of fragments, how to request to pull data from one fragment to another

view story

http://stackoverflow.com – I have fragments 'A,B,C' inside host Activity 'H'. I want to click a button in C, which will pull user inputted data from textviews or something in A and B. So that when it is done, I have collected all the data placed in fragments A,B and C. I imagine this requires some sort of interface but I'm a little confused as to how this might be done. I see this example shows how to pass data From a fragment to the host, and from the host to a fragment, but I'm not sure how to request info from one fragment to another. (HowTos)