A customer is implementing a feature in their project, where they monitor key strokes and mouse movements to see if a user is still active on the opened document. If they find that no activity has happened for a certain period of time, their app will pop up a warning box, stating that the window will be closed soon. Perhaps something could be added to Prizm in the way of an event that triggers when a custom timeout is reached. The developer could then have a certain action take place at that point.
Having this ability in the cusotmer's case helps alleviate concerns of their end users keeping sensitive documents open without supervision.