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   The Search Key attribute informs the system which indexes can be used for
   the consultation of a file.

   The Search Keys System creates an interface for searching data in the
   files associated to the various data entry forms. In this system, the
   indexes marked with the S attribute are displayed in a little window,
   and the data to search for can be entered. It is possible to enter
   complete or partial values for the fields that make up an index. It is
   also possible to activate a search window (see also paragraph Design
   search window in this chapter) in order to obtain a list of records
   ordered to the associated indexkey.

   Each index, therefore, can be defined as a search key. Each key can be
   associated to a different search window.

   The Search key is characterised by the S (Search Key)
   abbreviation.