The "projector" location you are talking about is where the bulb/LED bulb go for the halo corona ring lights - Angel eyes...
As rajindergill mentioned, that projector will reflect light back into the rings to light them up, but will also be lit dimly as part of your daytime running lights and any other time the angel eyes are on. Other than that it serves no purpose except for aesthetics.
Cornering lights are the fog lights, and will light up individually when turning or signaling when the fog lights are not turned on.
Adaptive headlights are the actual outer headlight that houses the bixenon fixture and will aim in the direction you are steering up to a certain angle.
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