LBB84

Curious... apparently somewhow using the remote keyfob, my wife managed to open all the windows (at the same time) and the sunroof. I wasn't there to witness the event and she doesn't know how she did it (she was reaching down getting the baby out of car at the time) but thinks she pressed something on the key! Is this a feature? Why would you want to open all 4 windows together? I can't see any reference to it in the manual!