Alright I don't know if this can be posted her or not but I know there were a lot of people who were asking about it at one point. I'll post a link to my guide anyways and if it's against GGFTW's rules let me know and I'll remove it. It may not work for a few people but it's still something worth trying out before you die. It's a cool program lol
How to multiclient
Oh and from what I've seen both clients get a different IP address just like if you were using two different computers. So ijji can't ban you for the same IP's.