Once the class or classes are selected, they may be assigned to an aggregate class by highlighting or creating a class in the ``Aggregate List'' and then pressing the ``Add >>'' button.
In addition, by clicking in the main image window with the right mouse button, the selected class will be highlighted.
Pressing the ``Select Class at Cursor'' button will select the class at the current cursor location.
The ``Highlight Classes'' button is used to draw the selected classes in the Highlight Colour displayed in the Viewing Options section.
Finally the PCT allows the user to recolour all of the classes in the input list based either on a PCT, or by generating a PCT such that it looks similar to the channels and enhancements specified.