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   By pressing Space Bar in correspondence to the name of the key field,
   the relative definition frame will be accessed.

   The mask allows the user to associate particular attributes to each key
   field that is found within the index expression.  This tells the system
   what type of control to have on the data issued and the mode with which
   the user can search for the data.  The name of the file that the key field
   pertains to, the name of the index to which it is connected and the name
   of the key field can only be viewed.