I belive you are refering to the PAR Extensions: (AKA Modifier Codes)
You can find guides on how to use the cheat system on the Help section here on the site under Using cheats http://www.jabosoft.com/index.php?articleid=21
You can visit the Jnes Cheat site here http://cheats.emulation64.com/Jnes/
You can get the Jnes Cheat Help File here http://cheats.emulation64.com/Jnes/cheatschm.htm
barkan 1218979578000 #1
thanks ( i couldnt find another place to post this, sorry )