I've been playing with AQ on 9.2 HP-UX 11.11 and have come across something I'm not too clear about:

I set up a queue on two databases, one queue sending to the other and put a payload on one end, but couldnt get it to propagate across to the other queue. After a few hours of going slightly mad, I worked out that propagation worked with a private database link but not a public database link. Is this normal behaviour - I cant seem to find anything about it in the docs?