SE450: Analyse Use Case: Retrieve messages [65/76]

1. User types in passcode. Telephone notifies Connection
2. Connection asks Mailbox to check passcode.
   (Add responsibility "manage passcode" to Mailbox)
3. Connection sets current mailbox and asks Telephone to speak menu
4. User selects "retrieve messages". Telephone passes key to Connection
5. Connection asks Telephone to speak menu
6. User selects "listen to current message". Telephone passes key to Connection
7. Connection gets first message from current mailbox.
   (Add "retrieve messages" to responsibility of Mailbox).
   Connection asks Telephone to speak message
8. Connection asks Telephone to speak menu
9. User selects "save current message". Telephone passes key to Connection
10. Connection tells Mailbox to save message
    (Modify responsibility of Mailbox to "retrieve,save,delete messages")
11. Connection asks Telephone to speak menu