At the moment it's 100% tied into our Discount Points system.

The actual part where you append "?referrerid=1" to your external URLs is a vBulletin feature :)
Any time someone clicks www.yourdomain.php/forums/?referrerid=1 user ID 1 will be added as the referrer automatically when the user registers.
 
You can use {vb:var bbuserinfo.userid} in the template you wish to display the userid in :)
 
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