1. Yes, they will be deleted.
2. Yes, they are kept when you install an app over an existing one.
2.5. No, you don't need to delete (uninstall) the previous app before installing a new one.
Thanks Erel for your answer
I am sorry to ask questions, but I am just starting to developp an Ipad application
Another quick question:
Is it possible to share a file or a sql data base between two applications on a Ipad ?
I want to devellop one application to load a data base when the customer is in his office
and another application using this downloaded data base (with no internet connection)