Its an Enemy/Ally tarcker. You and allies show up as yellow, while enemies show up in red. And the idea has been used so much you might as well add Capcom, Id, Epogee, Wild Tangent, 3DRealms.... The ammount of people using other peoples idea is staggering, and unfortunatly there is nothing that can be done.
What are you smoking?! This makes no sense. Input should make sense! Anywho, yeah. I am planning on, upon recieving 3d studio max 5, making a "Master Chief's Arm" set of models, holding rifels and other guns, with fire, redload, and melee animations..