If you've got little kids, I'm sure this sounds familiar. You hand your iPhone or iPad to your kid so they can play their favorite game and you can do something else for 5 seconds (any parents with me on that?). Within 3 seconds they have quit the app and are happily rearranging the apps on your home screen or deleting emails or otherwise quietly wreaking havoc on your digital life. The fix is called Guided Access and it is one of the best new features in iOS 6. We also use it a lot to lock iPads into the remote control app when using it to control home electronics like DVRs, lights, cameras, and thermostats in a home automation system. Here's the link from apple.com on how to set it up.