Understanding composite queues (forwardOnly)

[tomatgooglecode]

Hi there,

what is the there a difference (is there any?) between

          <compositeQueue name="A">
            <forwardTo>
              <queue physicalName="B1" />
              <queue physicalName="B2" />
            </forwardTo>
          </compositeQueue>

and

          <compositeQueue name="B1" forwardOnly="false">
            <forwardTo>
              <queue physicalName="B2" />
            </forwardTo>
          </compositeQueue>

I'm asking because I see unexpected behaviour when moving messages manually 
between those queues or from dlq back in that queues with the latter setting.

Thanks for clarification.