A device comprising: a display for displaying a multi-layer application, the multi-layer application comprising a plurality of user interface layers (202a-202d); an interface for receiving a finger-touch input from a user, the finger-touch input having a degree of pressure which exposes a corresponding amount of finger surface area to the interface; a sensor coupled to the interface, the sensor configured to create an image of the amount of finger surface area exposed to the interface by the finger-touch input, the image including one or more identifying characteristics of the finger, the number of the one or more identifying characteristics of the finger depending on the degree of pressure of the finger-touch input; and a processor configured to: analyse the one or more identifying characteristics of the finger; identify one of the plurality of user interface layers based on the number of the one or more identifying characteristics of the finger matching respective identifying characteristics associated with the one of the plurality of user interface layers; identify access rights for the identified user interface layer based on the one or more identifying characteristics of the finger; determine that the identified access rights permit the user to access the identified user interface layer; and display the identified user interface layer. a display for displaying a multi-layer application, the multi-layer application comprising a plurality of user interface layers (202a-202d); an interface for receiving a finger-touch input from a user, the finger-touch input having a degree of pressure which exposes a corresponding amount of finger surface area to the interface; a sensor coupled to the interface, the sensor configured to create an image of the amount of finger surface area exposed to the interface by the finger-touch input, the image including one or more identifying characteristics of the finger, the number of the one or more identifying characteristics of the finger depending on the degree of pressure of the finger-touch input; and a processor configured to: analyse the one or more identifying characteristics of the finger; identify one of the plurality of user interface layers based on the number of the one or more identifying characteristics of the finger matching respective identifying characteristics associated with the one of the plurality of user interface layers; identify access rights for the identified user interface layer based on the one or more identifying characteristics of the finger; determine that the identified access rights permit the user to access the identified user interface layer; and display the identified user interface layer. analyse the one or more identifying characteristics of the finger; identify one of the plurality of user interface layers based on the number of the one or more identifying characteristics of the finger matching respective identifying characteristics associated with the one of the plurality of user interface layers; identify access rights for the identified user interface layer based on the one or more identifying characteristics of the finger; determine that the identified access rights permit the user to access the identified user interface layer; and display the identified user interface layer.