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   Memory variables can be defined in design of a data entry format or in the
   Data Dictionary, in the environment relative to the symbols. Whenever a
   variable defined is not referenced (not used) by any object, no explicit
   declaration in the sources will be generated. Otherwise, the variable will
   be declared STATIC in the source module relative to the object that
   uses it.

   The variables can be of type Array, Character, Data, Logical, Memo,
   Numerical and Object.

    . Useful information about the input validation that can be
       performed on the data entered into the variable control, please
       consult the Field controls chapter.