title: iphone: single sign on implementation
body: <p>I have a situation where I have a couple of apps say App A, B, C and D</p>
  
  <p>now A, B, C are part of the same package and if user jump among A, B, C the applications will not ask for username and password again (Single sign on for A, B, C)
   but it tries to access D the system will ask for credentials.</p>
  
  <p>can you show me some way to attain this? Please enlighten me on this.</p>
  
  <p>Thanx in advance</p>