G15 keyboard question

i recently bought a G15 keyboard and have been playing with the settings to get it set up the way i want. I"m just having one problem so hopefully someone knows whats up... i can't seem to figure out what the 4th LCD button is suppose to display. the 1st button shows char stats, 2nd shows BG info, 3rd shows incoming tell alerts, but the 4th does nothing. Anyone know if this one is suppose to be blank, and if so, is there any mods out thwere to add some functionality to this display?


thx for any help u can be