An electronic device comprising: a display; a housing enclosing the display and defining an exterior surface region adjacent to the display, the exterior surface region having a plurality of surface zones indicated thereon, the surface zones being capable of being written on by a user to save a written marking thereon; a memory; and user input apparatus; the device having: a first mode in which the device performs a function in respect of a subject entity and in which in response to operation of the user input apparatus to indicate one of the zones the device stores the entity in the memory in association with that zone; and a second mode in which in response to selection of a zone by means of the user input apparatus the device performs a function in respect of an entity stored in association with the selected zone.