title: Universal app for iPhone SDK 4.0
body: <p>I have updated my SDK to the latest version: 4.0. So now I am able to create iPhone apps and iPad apps. I want to create a universal app. How can I do this?</p>
  
  <p>If we created a universal app, does this mean this app works on both iPhone and iPad? How is this possible, as the screen size should be varied according with UI designs. I am not sure about this.
  And also, I already created an iPod touch application using iPhone SDK 3.1.2, can I make this app a universal app?</p>
  
  <p>Can anyone help me?</p>
  
  <p>Thanks in advance</p>