The window 419 is used to show the user the identifiers of a certain type, namely the creative type, assigned to the user in the identifier table. In the embodiment shown in FIG. 18, the user is “Ulrike”. In the embodiment shown in FIG. 18, the user Ulrike already has three IDs of the ID type “Creative Type” in ID table 312 assigned to her. In order to determine the contents to be displayed in window 419, the UI inventory routine is executed as part of the UI start routine. The UI automatically generates an inventory request with an inventory criterion as part of the UI start routine. This inventory criterion is selected in such a way that when the UI is used in the inventory routine of a server, all identifiers stored in the server's identification table are read, which are assigned in the identifier table to a specific user or user group to which the specific user belongs according to the server's user group table, and which are assigned the identifier type “creative type” in the identifier table. In the embodiment shown in FIG. 18, in response to the inventory request signal thus generated, the UI receives the inventory signal from the server, which tells the UI the 3 identifiers assigned to the user “Ulrike”. These are displayed by the GUI in window 419. FIG. 18 also shows that in the GUI it is possible to use a placeholder and a picture instead of the identifier itself, i.e. instead of a UID, UUID or GUID possibly intended as identifier. This makes it easier for the user to display the identifiers. In the background, however, the UI remembers the identifier assigned to the respective image or the respective placeholder.
