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Macroinstructions that operate on message segments and perform functions such as (a) message editing, (b) checking validity of codes used in the header, (c) routing messages to specified destinations, (d) maintaining logs of messages, and (e) checking for errors in transmission or specification.; 对报文段进行操作的宏指令,完成以下功能:(1)报文编辑,(2)检验报头码的有效性, (3)将报文送到指定的目的地,(4)管理报文登录,(5)校验传送或说明中的误差。