| Class | MessagingException | Failure in messaging. |
| Class | MessagingUnavailable | Messaging systems are not available. |
| Class | QueueNotFound | Raised if the queue was not found. |
| Class | QueueEmpty | Raised if there are no queued messages on a non-blocking read. |
| Interface | IMessageSession | No interface docstring; 0/1 bools, 8/8 methods documented |
| Interface | IMessageConsumer | No interface docstring; 1/1 methods documented |
| Interface | IMessageProducer | No interface docstring; 4/4 methods documented |