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   Cfts_Open( <expC>, <expN1>, <expN2> )

       Purpose

   Open an existing CFTS index file.

       Parameters

   <expC> is the name of the index to be opened. Path names are 
   supported.

   <expN1> is the size of the CFTS internal buffer expressed as 
   kilobytes.

   <expN2> is the file mode in which the index is to opened.
   Acceptable values are :
       0    READ-WRITE + SHARED
       1    READ-WRITE + EXCLUSIVE
       2    READ-ONLY + SHARED
       3    READ-ONLY + EXCLUSIVE

       Returns

   A CFTShandle (0 through 63) for the index. Errors are trapped by 
   Cfts_Err().

       Comments

   The value of a CFTShandle is an arbitrary integer. Its specific 
   value is meaningless except to CFTS library and should not be altered 
   by application code.