You know how internet connection rarely works at big conferences? In our case each participant had to take a questionary on the iPad, and their answers would have to be sent to the web service which we've built for this project before. But how do they do it without wi-fi connection? Well, we have developed an app that saves all entered data in device's local storage, and when connection is available an administrator puts his email address in order to synchronize device with web service, where now that data is available for viewing, exporting, etc.