3.1.5 Message Processing Events and Sequencing Rules
The client receives the ROP responses in the ROP output buffer. These ROP responses appear in the ROP output buffer in the same order as they were sent in the ROP input buffer. The ROP output buffer can also include ROP responses that do not have corresponding ROP requests in the ROP input buffer. These extra ROP responses include the RopBackoffROP (section 188.8.131.52), the RopBufferTooSmall ROP (section 184.108.40.206), the RopNotify ROP (section 220.127.116.11), and the RopPending ROP (section 18.104.22.168).