Allows you to set up in advance which color globule your raid should kill for each possible color combination. This choice is then announced via /rw or /raid (or additionally via a yell, a private raid warning, or a private chat message) when the globules spawn.
The defaults for LFR and normal modes follow the Purple > Green > Yellow priority.
The defaults for heroic mode follow the Icy-Veins website. (As of 12/15/11.)
You can change the kill target of any color combination in the Interface - AddOns options menu.