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   By pressing the Space Bar on a lookup relation, the relative
   definition frame, shown in the following figure, will be activated.

   Within this mask it is possible to set properties that do not get defined
   in automatic or to modify other properties already set. The information
   relative to the Name of the selected file, the name of the parent lookup
   file and the index number used can only be viewed.  The data relative to
   the positioning key and the lookup mode on the index and a Key, Filter and
   Break on the search window, are also shown and can be edited inside the
   environment activated by the Options button.