title: What is the significance of caddr_t and when is it used?
body: <p>Can somebody please tell me:</p>
  
  <ol>
  <li>What is <code>caddr_t</code> ?</li>
  <li>When is it used ?</li>
  <li>How it is different from <code>void*</code> ?</li>
  <li>When to use <code>void*</code> and when to use <code>caddr_t</code> ?</li>
  </ol>
  
  <p>Thanks in advance.</p>