Mary,
it's trying to implement Balamurali's request:
https://www.opensource-socialnetwork.org/discussion/view/5314/track-user-referrals
Read the source, turn on Ossn error logging and you'll get an idea ...

Before using, please tell more about this component what is for? To invite other people for register or to invite a groups?

Thanks a lot Z-Man. Awesome. Will test this and let you know. Thanks Again.