I want to launch an application that already exist in device on the click of home button in iphone when some other application is running .
I have implemented launching an app from a running app but i wanted to launch it when the running application goes into background.
While you could call the method to launch the other application, I’m pretty sure this violates Apple’s policy on use of the home button. If you plan to submit your app, you will almost certainly get rejected for this practice.
For details, see Apple’s Human Interface Guidelines.