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System bytes. System bytes are the last 4 bytes Among the 10 bytes in the SECS header. As long as this value is unique to the transaction waiting for a reply (open transaction) it can be anything, but normally it would be good to have it increase by +1 for each primary message sent.
The secondary message's SystemBytes must be the same as that of the primary message.
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long GetSystemBytes();
void SetSystemBytes(long lNewValue);
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