You just install it and use that for playing online.
You can have two multiman version installed if you want both a stealth version and the regular offline version.Code:http://www.sendspace.com/file/4fifzl
I recommend using psnope also. Proven to help stop bans unless your using the console id thats been making its rounds for sometime now. There is now way to stop an account ban with that CID so you will always need to make a new acct from day to day or hour to hour.
Hope that helps, Cheers :)