Editing WoW:API SetOverrideBindingSpell (section)

== Arguments ==
; owner : Frame - The frame this binding "belongs" to; this can later be used to clear all override bindings belonging to a particular frame.
; isPriority : Boolean - true if this is a priority binding, false otherwise. Both types of override bindings take precedence over normal bindings.
; key : String - Binding to bind the command to. For example, "Q", "ALT-Q", "ALT-CTRL-SHIFT-Q", "BUTTON5"
; spell : String - Name of the spell you want to cast when this binding is triggered.