After we purchase and install your system, we would like to limit who can create or respond to threads to registered users. I think that is the way it works by default – correct? But how can we limit who can register? We want to limit that to registered users of our software. Is there an API we can build from that can query into our user database or if that can’t be done can we have the system in some way email our support person who can then deny/approve the registration after we manually look them up in our database?