Is there an add-on someone knows of or is it possible to give a person a code they could use at sign up to obtain a particular user group immediately?

[Chernabog]

Thought it would help to put most all of my question in the thread title. I am looking for a way to do two things:

1) Have a new registration immediately be given a particular user group. This would make new volunteers joining our site a lot easier to work with as they would automatically be given a staff user group and, ideally, even the staff title being checked off -- somehow?

2) Sending a message especially for the team registered user after they join with the code or whatever -...

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Is there an add-on someone knows of or is it possible to give a person a code they could use at sign up to obtain a particular user group immediately?

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