JMS Queue Pub/Sub

I'm trying to learn a little more about Spring JMS support and wondered if someone could answer the questions below.


1) By definition, Queues don't support pub/sub, topics do. So how does spring support "pub/sub" when the destination type is a queue? Does it poll the queue every second or something?

2) Queues only allow for 1 client to receive a message correct?

Thanks
Steve