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 GT_AND()         Perform a bit-wise AND operation.
 GT_B36TOD()      Turns a Base36 number into a decimal
 GT_BINARY()      Turn a charcter string into a binary number
 GT_BTOD()        Convert a binary string into a decimal number
 GT_DTOB36()      Turns a decimal integer into a Base36 number
 GT_DTOBIN()      Turns a Decimal number into a binary string
 GT_DTOH()        Turn a decimal number into hex
 GT_HTOD()        Turns a Hex string into a decimal integer
 GT_INV()         Performs binary inversion on a character string
 GT_OR()          Perform a bit-wise OR operation.
 GT_XOR()         Perform a bit-wise XOR operation.