Load another application when entering background

Question

Is it possible to load up another application when the first application enters the background?

Say I have application 1 and application 2 installed. When application 1 enters the background, the method is called to invoke the loading of application 2, but application 2 is never loaded.

Is it possible that Apple have disallowed this sort of thing?

I am 100% sure that the custom URL schemes I'm using are able to be called as I have done testing within MobileSafari to make sure they work.

Should mention this is for an iPad application and not iPhone application. Albeit, I don't think there should be much difference between the two when it comes to this issue...

EDIT

Let me explain. The application itself is for a specific purpose. What we want to do is allow our clients to set a setting that will allow the application to "bounce" back via another installed application. We want to limit the users of the application to only be able to use the application in question. This is due to the fact that the iPad's using this application will ONLY be using this application. Hence why we want to lock it down as best we can.

Answer 1

This will not work, simply because the application can only have the system open URL schemes while in the foreground. Think of it like this, if your application is not in the foreground can it, say, present a modal view such as a UIAlertView or a simple Modal View Controller?

Also, you would be horribly breaking Human Interface Guidelines and would most likely be rejected. URL schemes, especially custom ones, should only be called when the user prompts.

Answer 2

Sounds to me like you want a lockdown/kiosk iOS system. There's simply no way to do this and make it work like they want without breaking out of apple's sandbox. Jail breaking. Or, write one application with two halves. The initial half with authentication or whatever, then the secured half. Maybe we need more context, but as you describe it, URL schemes are incredibly easy to circumvent or fail altogether. What happens when they just delete the goto app?

Answer 3

Now why would you do that? Say the user is getting a call and he proceeds to take it. He definitely wouldn't want to go to another app in between. Other case considered, he would actually leave your app to go to another app he wants to attend to without being taken to another app in between.