The "Comfortable Access" means that BMW 3 E90's access to the control can be obtained without taking the key out of your pocket. You just have to have the key to yourself, and it will be automatically recognized when you get inside the car or you'll be in the immediate vicinity.
In addition, it is possible to use the function of comfortable access to start the engine, separate the lid of the boot, close the car in comfort mode, lock and remove the car.