If this class is placed in the DB tree, there will be one instance of this class per study.
It is usually placed immediately after the root class and is used to differentiate between the studies.
For example, let us say that we read 3 files "A.dcm", "B.dcm, and "C.dcm", file A is part of study #100, and files B and C are part of study #200. If the class tree only contain the "Study" class, the resulting database tree will be:
From the Graphic Interface
This class does not have a graphic interface.
From the Display area
There is no display area interaction specific to this class.
From the Keyboard
There is no keyboard interface specific to this class.
From the Command Line
There is no command line for this class.