Every message sent to the server message queue is assigned an identifier. This function returns the identifier for the last message that was either sent or received by the client. Once established, the identifier can be used as an argument for other functions, to check the status of a queue message or to delete it.

The following example method could be used to acknowledge receipt of a queue message. The return message belongs to the category "Response".

QueueMessage "Received: "&MessageId, ToSender, "Response"