Managing users with SIP

In our web application, we have users defined by their login, password, e-mail address and group.
We want to use SIP to synchronize users of our application with the ones in the forum.
The idea would be to scan our users and call signIn to check if they are in the forum database. If they are not present, then call Register. Then synchronize the user group with the forum groups using isGroupMember, addUserToGroup and removeUserFromGroup.
 
However, several questions come to my mind:
1. What if the user is changing his password or e-mail address in our application? How do I update the forum user in that case? It seems that there is no method for editing users information such as password or e-mail. I could recreate a new user if the password has changed because SignIn would return false, so I would use Register, but what if the user is changing his e-mail address? How could I update the e-mail address of a forum user using SIP?
 
2. If a user is deleted in our application, how do can I delete this user in th forum using SIP?
 

1. There is a topic in our tutorial forum to handle this password and email issue. We don't use the SIP, but simple SQL script to accomplish this.
2. You can use a simple SQL statement to ban or inactivate that account. This is as effective as deleting an account from users perspective. Then, when you want to clean up inactive users, you can do so in the admin control panel.
   

Thanks for your reply.
 
I have seen the tutorial about the password change, but not about the e-mail update. How can I update the e-mail address of a forum user?

you use the same update statement as the one for updating passwords, and the column name for email is [email].