At present,

  The GUI has created a NetworkConnection
  From that Network, it has created a Mailbox
  From that Mailbox, it has requested a list of
    messages in the Inbox
    (we'll call that list messages);
  The GUI calls the preferences class to get
    preferences for organizing messages

  Options currentOptions = new Options(userName);
  SetOfRules ordering = 
    currentOptions.getOption("sorting or filtering or something");
  SortFilter filter = new SortFilter(ordering);
  messages = filter.sort(messages);
  pop up a new Inbox window and display the messages
  // For each message, we just have the message header
 
  for (int i = 0 ; i < messages.length(); i++) {
    // Get the information on that message
    MessageHeader info = messages.getHeader(i);
    String from = info.get("Sender");
    String to = info.get("Recipient");
    String date = info.get("Date");
    String subject = info.get("Subject");
    someCoolJavaCodeWeWrite(from,to,date,subject);
  }

  // User clicks on a message.  Remember which message
  // they've selected.

  // User selects "Display the message already!"
  // Goal: Display the message
  // Check preferences (skipped)

  // Get the message
  Message messageToDisplay =
    mailbox.getMessage(
      messages.getHeader(messageNum).getField("Message Name"))
  // Display it (implementation-dependent)

  // User requests a picture of the sender
  PhotoInt photo = new PhotoStub(userName);
  photo.displayPhoto(); // If there is no picture,
                        // this displays a picture of

  // User wants to reply
  // Determine if the user wants it quoted.
  // Determine the user's preferences
  
  MailMessage mynewMessage;

  // Eventually ...
  SendMail outgoing = new SendMailStub();
  outgoing.sendMessage(mynewMessage);