Referral Flow and Correspondences

Summary:

Does anyone here use Referral correspondences? I'm trying to understand the referral flow and the specific triggering event on when the candidate receives the correspondence.  

Content (required):

Job-Specific Referral, Agent

Job-Specific Referral, New Candidate

Job-Specific Referral, Registered Candidate

Unsolicited Referral, New Candidate

Unsolicited Referral, Registered Candidate

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):