1. A computer-implemented method of displaying an iconic representation of a computer instruction to perform an action upon an object, comprising the steps of: displaying an iconic representation of each of a plurality of actions for inspection and selection; selecting the action from said plurality of actions by selecting the iconic representation of the action; displaying iconic representations of only objects which can be acted upon by the action; selecting the object from said plurality of objects by selecting the iconic representation of the object; and in response to selection of the iconic representation of the object and to selection of the iconic representation of the action, displaying an iconic representation of the action combined with the object, the iconic representation of the action combined with the object representing the computer instruction to perform the action upon the object.