Locking Android to one App.?

[Jayo]

Is it possible to prevent a tablet running Android from exiting my app.?

The app. is intended for stores and offices, so I don't want customers messing with the OS. I want the app. to turn the lock off with a password.

Can this be done without modifying the OS? I'd like to avoid installing a custom version of Android.

[Equazi]

Android application are installed under linux user ids and none of them are privileged nor can they be made so which is a good thing for most of us.

The easiest method would be to have your application installed by the OEM or carrier but you'll need your app to be signed with the platform keys and mostly that's limited to big ticket applications and features that are done with carrier installs.

Easy to do if you roll your own version of Android for your app which I would encourage you to do.