Get the key of a Clipper index
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 Syntax

        GT_GetIndexKey( cIndex, cKey )

 Arguments:

      cIndex - Index file to get from
      cKey   - Key to be returned (passed by reference)

 Returns:

      File error code - 0 if OK

 Description:

      Opens the given index file as a binary file, and retrieves the key

 Examples:



 Header File: GT_LIB.CH

 Source: GETINDEX.PRG

 Author:  Martin Colloby