Asynchronous web service

Hi,

I am trying to understand the asynchronous web service (using http transport). I had a few questions, it would be very helpful of some one can suggest any links, books or even answer the questions.

What are asynchronous web-services?

What I have understood is that whenever a web-service is invoked the client continues its execution and specifies a callback method (like Axis2). How does the call back happen?

How can we know that the service is asynchronous from the WSDL ? An Asynchronous web service I had seen had specified some ws-addressing information for the header. Will this be used for generating the reply, asynchronously?

How can I write a client?

Any help would be appreciated.

Thanks,
Sash

"sash",
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thanks,
Dave

Thanks for correcting me