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   The Window object is in fact a Browse object, with the only difference
   that the system will in not ask for associating a 1:N relation to the
   object.

   A Window object can only be defined as a "free" object (which means: not
   associated to any other object) in the Entity environment, so that it
   can be included in the data entry management (ex. associating its
   activation when a button is pressed).