Yeah, I wasn't sure what kind of checksum it was. I did some basic XOR tests with a small string and it didn't match up.

Thanks for the info.

>It returns a CRC-16 checksum.

>>I saw it, but there is no documentation of whether it is an exclusive-or checksum.
>>
>>>>What is the easist way to construct an Exclusive-or checksum of a character string?
>>>>
>>>>Is there a single command/program I can use, or do I need to process the string char by char >>>and use a combination of BITXOR() and ASC() commands?
>>>Hi Craig,
>>>Did you have a look at SYS(2007,Cexpression)
>>>regards