Replication Server normally uses command tags for two purposes:
To reassemble the commands in a transaction so that data servers at remote sites execute the transaction as a unit
To ensure that each command is processed only once
The syntax for command_tags is:
[@origin_time=datetime_value] @origin_qid=binary_value @tran_id=binary_value [@mode=0x08] [@standby_only={1 | 0}]