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   Pressing the Space Bar in the graphical display environment in
   correspondence to the 1:1 relation will bring up a definition frame as
   shown in the following figure.

   The definition frame allows to enter characteristic data of the relation
   previously set. Data regarding the file name, eventual alias' and relative
   descriptions, the name of the relational parent file and the relative
   index number can only be viewed. The definition of the referential
   integrity mode of the data and the expressions of keys, filter and break
   on a relation can be posted within the environment activated when pressing
   Options.