title: Create a 'dll' in Objective C
body: <p>I am still going through a beginners textbook but nowhere does it explain how to create and reference a 'dll'.  I assume its called something different but if I wanted to for example create a dll to store all my LocaleHelper code, how would I go about creating it and then referencing it.</p>
  
  <p>I see in xcode you can't add more than one project?</p>