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    CRC32()

         Returns a CRC32 polynomial of a block as PKZIP

    Syntax:

         CRC32( cBlock ) -> cCRC

         cBlock  : The block to calculate

    Description:

         Calculates a CRC 32 bits polynomial of a character or memo value.

    Return:

         A character value with the CRC.

    Example:

         ? CRC32( "Hello" )                   // e.g. edb88320h
         ? CRC32( MemoRead( "Fast.txt" ) )    // e.g. feda3139h