Sequence is a Word property that indicate the processing order for a packet in a multi-packet FSP protocol exchange. Sequence values originate with the value 1 (One) and increment by 1 (one) until all packets in the protocol request or response have been transmitted. 

Sequence is used to ensure that packets are received and processed in the correct order. 

Use Key to determine the unique identifier for a FSP protocol request or response.

Key