Comfort Access Behavior

[mtech8]

Has anyone ever left with the key when the car is running? I was driving this weekend in my MB S550 with my wife. She had the key in her purse and left the car to go get a number inside a restuarant. I was to park to car when all of a sudden the info screen in the dash, turned red and informed me that the key was no longer detected! Should have drove it to figure out what would happen. But my first reaction was to simply call my wife to come back. Just curious how BMW handles this situation.

Also since the BMW keys remembers last settings via the key. What happens if both keys with different setting (using comfort access) is brought simulatenously into the car?