Launch an app from within another (iPhone)

Question

Is it possible to launch any arbitrary iPhone application from within another app?, For example in my application if I want the user to push a button an

Answer 1

Swift 3 quick and paste version of @villy393 answer for :

if UIApplication.shared.canOpenURL(openURL) {
    UIApplication.shared.openURL(openURL)
} else if UIApplication.shared.canOpenURL(installUrl) 
    UIApplication.shared.openURL(installUrl)
}