JMS durable subscriber question

In JMS, we can associate a client id to a topicconnectionfactory. I want to

know the significance of this client id.

to implement a durable subscriber is it always necessary that the topic

connectionfactory has a client id?

also in the createDurableSubscriber() interface, the second argument is

what is called as 'subscriptionName'. Is this the same string as that of the

client id? I am not able to get this durable subscription working as of

with weblogic jmsserver.

Does any one have a working simple example of a publisher and a durable

subscriber?

Thanks

[643 byte] By [smnaveen] at [2007-9-26 3:39:07]