Wanted ID for invited person.
Introduction of invited person.
Reason for registration. Purpose and expectation. (If he just wants to come and download, please say no.)
Suggestion to forum from the invited person.
This is a one-vote veto system. If any forum staff says No, the application is rejected.
If there is no objection in 7 days and we have at least 3 "YES", account admin will send Invitation by PM and close that application thread.