Does iMQ use ip-multicast?

I see that Java Message Queue supports publish/subscribe way ofpropogating messages. Can this be done using ip-multi-casting?Is this part of JMS standard or an implementation issue? I wouldreally appreciate if someone could get back to me on this asap.
[287 byte] By [christenscreen] at [2007-11-25 8:07:41]
# 1
The use of ip-multicast in not part of the JMS specification - it isa design choice JMS providers make. JMQ does not use ip-multicastto do pub/sub.
christenscreen at 2007-7-1 13:58:56 > top of Java-index,Application & Integration Servers,Sun Java System Message Queue...