is there a way to know someone's referral out here?

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hello, forgive my ignorance but i keep reading some posters here mentioning that you can check if a member has a referral here or not. i tried to look on one on my list just to see if that is possible but i dont see a link that will direct me to that. is that possible? how can you see if someone has a referral or not? my intention for asking this is not to check anybody on my list, i am just trying to learn something each time out here in mylot and that is something i havent figure out yet so if you could direct me on how to do such thing i will be so thankful as i have learned something new again. thank you so much for the time and interest and appreciate your response. takecare!