You cast Righteous Defense on a player (redirects 3 mobs on that player to you).
You cast Hand of Reckoning on a mob (taunt a mob).

Personally I don't use friendly nameplates, only enemy ones (gets too confusing for me). I use grid + clique to see if any raidmembers have aggro that are not supposed to have it and then just right click on their name (which casts right def on them). Everyone uses of course what he is used to and find the most easy, but i find this way superior to any mouse over macro's myself.