Interactive Applications - Reading & Writing!

When we think of the term "interactive", we often presume application to the realm of computers and lingo associated with these devices . . . e.g., interactive gaming, learning, e-cards, etc. It's not so often that we associate traditional reading and writing with interactivity. Consequently, we do ourselves a disservice by essentially having forgotten the importance of the relation between such basic, traditional applications. 

Name an interactive activity we might do when, or as a result of, reading or writing.