[Koha] Custom preferences

Hey, I'm wondering how can I find all the system variables within koha because I'm interested in setting my own system preferences. I just don't know what would be the correct system variable for the parameter I wish to set some preferences for. Can any one help? Thanks, Noel Image by FlamingText.com --------------------------------- Sick sense of humor? Visit Yahoo! TV's Comedy with an Edge to see what's on, when.