How can i delete a process instance if an included user input task is closed by

How can i delete a process instance if an included user input task is closed by user.Let say there is a proces that has 3-4 chained input task.I want if a user close the browser window on any of these task then process instance should get deleted.I mean it should not be present in the reports.Also is there any way to show a warning popup to user before closing a browser window....

OriginalPostID-83608

OriginalPostID-83608