is it possible user register other user?

hi.
i want have 1000 user that can register other user and each of them can only register 3 user.
for example userA is one of that 1000 user, then userA can only register 3 user then i need to occur 2 event:
1- send user pass in the sms for each of that 3 user
2- a way to i know each user registered by who? (for example i want understand this user register by userA that one of 1000 user)

how to do this?is it possible to use cb for this?

Users can't register other users. They'd have to logout and go through registration again. At that point you won't be able to really track this. Sounds like you don't want them to physically register users though, but to send them an invitation to register in which case I recommend just using CB Invites for that. No CB Invites does not support SMS invites, but is done via email.