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   dBsee creates index file names by taking the first 7 characters of the
   file name and adding a progressive suffix (ex. the first index file for
   the Clients file would be Clients1.NTX). As DOS file names can be up to
   eight characters long, and dBsee will overwrite the eighth character with
   the suffix, 2 distinct files, of which the first 7 characters are the
   same, would finally share the same index files. As this is not allowed in
   dBsee, it is advised to use only the 7 leftmost characters for the name of
   the file.

   To determine which indexes are to be associate to each file, please
   consider the following points:

     . One index will be defined as a primary index. This index has
       an indexkey expression, called primary key, that uniquely identifies
       each record (ex. the code of a customer). The primary key must contain
       a minimum amount of information necessary to uniquely identify the
       record (ex. the lastname plus the firstname plus the birthdate could
       uniquely identify a customer; in this case, using only the lastname of
       the Customer would yield duplicate entries in the file).

     . The primary key allows to identify each single record, its
       value should not be duplicated upon insertion. dBsee allows 2 modes to
       enter the primary key value: entered by the operator, or computed by
       the application. In the first case, verification is done on the data
       entered.

     . Secondary indexes can be defined for building relations, for
       ordering data in windows or reports, or for searching data.