I wasn't able to take a picture to upload (no camera) but my car has a button outside of the trunk. its faced down on that part of the back of the trunk thats parallel to the floor. its a black button, I pressed it and nothing happened and I have no idea what this is for. Any ideas? does everyone have this button and what does it do?

 

Is this the one by the license plate? if so, it pops the trunks if you have the SmartKey