i'm ab beginner in xcode.
I have make an app with a button to start an website.
My question. Is it possible to make a button in an app to start another app?
If you just want a website you don't need another app. You could certainly tell the iPhone to open the url using mobile safari app but you could also just include a webview in your application.
Can you give some more detail on what you want to do and what kind of webpage you want to open?
As jonnymo5 said, more detail of your needs would be helplful.
The following code will open up the URL into Safari. I connect a button to it, in Interface Builder in my case. This will push your app in the background of course.