title: Is it possible to have multiple iOs versions on mac?
body: <p>I recently updated my Xcode to Xcode 3.2.5 and iOs 4.2.</p>
  
  <p>Can I hold older versions of iOS (like 4.1, 4.1 and 3.2) in a way that I will be able to set the "Base SDK"?</p>