which hook involves the banning process?
 

I was looking for some hook that mentioned changing group ID or something, wasn't able to find it. Can somebody clue me in which hook would be involved for that process? Thanks in advance.:)

I'm not sure exactly what you are looking for. But, to find it yourself, go to the page you are banning the user from, look at the url to find the page, and then look at the php page and see what hooks are available. I'm not sure what page you are doing this from since you didn't really clearly explain what you want to do.