title: What are Private FrameWorks and how will we use them?
body: <p>My Question is about private framworks in IphoneOS3.1SDK dirctory </p>
  
  <p><strong>/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS3.0.sdk/System/Library/PrivateFrameworks/</strong></p>
  
  <p>What are they ? and when i added one of them to my project, they didn't have any headers?
  How can i use them in my project?</p>