Cancel All Quotes
The CancelQuotes message will force Metro to cancel all quotes that are currently active. It takes a Message Identifier (which can be any integer) that will be returned in the reply notification, included for the purpose of keeping track of the response to this particular sending and receipt of the CancelQuotes message.
Cancel Quotes Acknowledge
This notification is sent to the client upon receiving a request to cancel all quotes. The second field is the identifier provided in the client request to cancel quotes.