If you include reference names and email addresses in your online application, the application will automatically email your references on your behalf.  References will be given a link to return letters that are posted to your application file.  In this case, you will not be able to see the content.  You will only know the letters have been received.  But you may retrieve your reference letters yourself and then upload them to your application file.  These letters you will be able to review. Either process is acceptable.