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   In case that a Lookup relation is set between a regular file and a Table
   file, the Definition frame will be different from the one shown for the
   lookup on a regular file, since the whole functionality is supplied
   automatically by dBsee. For a lookup on a table file, in fact, searching
   is done on automatic windows, and the insertion of missing codes is done
   on automatic data entry forms, created at run-time.

   Lookup relations on table files only demand to establish whether the
   insertion of data in the lookup field is to be mandatory or optional. The
   options available are: Allow empty key (the key can be left empty but
   if filled, the data will be verified), May not be empty (it is
   mandatory that the fields contain valid values) and May be everything
   (the field can contain any value). The definition of the desired type can
   take place within the environment activated with the Options button.

   The Table file must be the last element in a relationship branch. It is
   not possible to select a Table file as a parent in relationships.