本文介绍了FIX协议中关键字段SENDERCOMPID、SENDERSUBID及TARGETCOMPID的作用和设置方法。SENDERCOMPID用于标识发送应用程序，SENDERSUBID标识具体实例，两者组合确保消息来源唯一性；TARGETCOMPID则指明消息接收方。
message.setTag(SENDERCOMPID, SENDERCOMPIDVALUE); // 49
message.setTag(SENDERSUBID, VIPERINSTANCE); // 50
message.setTag(TARGETCOMPID, TARGETCOMPIDVALUE); // 56
49 --> SENDERCOMPID
Which component sends out the fix msg? --> generally your application name.
50 --> SENDERSUBID
Which instance sends out the fix msg? --> generally your instance id
49 + 50 must be unique, to label the source of the fix msgs.
56 --> TARGETCOMPID
can be omitted. nobody cares. Just set a meaning value, that's good enough.
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