1. A method of generating a set of graphical objects to be displayed by using OPC UA specification, the method comprising: indicating, by means of using OPC UA nodes, graphical objects to be displayed, said graphical objects representing physical components of a monitored process; indicating, by means of using OPC UA references, how an indicated graphical object should be interconnected to another indicated graphical object when displayed; associating the respective OPC UA node with a corresponding predetermined graphical object; generating the set of graphical objects from said associations and interconnecting the individual graphical objects in the set in accordance with the indicated interconnections; displaying the generated set of graphical objects; and assigning a data value to at least one of the indicated graphical objects by means of using OPC UA attributes, wherein the assigned data value is of a write-type indicating that the assigned data value is to be sent to the physical component corresponding to said at least one indicated graphical object for controlling a property of the physical component stipulated by the OPC UA attribute.