[Mazzlefizz]

Originally Posted by Charybdis No, it was a default blizzard binding. Thanks for the reply Vald.. will take a look around that area, may've missed it (been some long hours at work unfortunately)

I could be wrong, but I've never noticed any blizzard bindings for assigning raid targets. I've also seen add-ons specifically to do that, as well as explanation of how to do it with macros, which suggests to me that it's not built-in.