TCAS = traffic collision avoidance system... those are the voice saying, "Climb. Climb now. Climb, crossing, climb. Climb now or you're gonna die, you idiot."
GPWS = ground proximity warning system... that's the voice saying, "Too low, gear. Too low, flaps. Don't sink. Sink rate. Hey dummy, you're getting kinda close to that mountain."
Thanks, Nitrogen, I'll take a look at 'em later.