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 cNtxKey()              Returns the index expression of a NTX index file
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   Syntax:              cNtxKey( <cNtxFileName> )  --> <cIndexKey>

                        This function opens a NTX file and retrieves the
                        ascii description of the index key used.

   Parameters:

   <cNtxFileName>       The name of the NTX file.

   Returns:

   <cIndexKey>          A string with the key description.

   Source code:         SOURCE\\FUNCTION\\NtxTools.c