Implementing Asynchronous comm. in WebService & its client

Hi Friends,
I am trying to implement Asynchronous communication between a WebService & its Client. I am using Sun JWSDP 1.6.
My doubts are:
1. Is there any difference in WSDL? If yes, then What?
2. What are the differences in WSDL for
a. Client Call-Back or
b. Polling
3. How to use JWSDP to implement such communication?
Thanx in advance.

Thanks swatdba,
I came to know later that JWSDP 1.6 doesnt have support for Asynchrony, but my concern is about WSDL.
* What needs to be published in WSDL for Asynchronous support in WebService?
* I studied WSDL of an Asynchronous BPEL process. It has
2 Service endpoint definition,
2 Ports and
2 Bindings
- One for Request and the other for CallBack
Can anyone explain me what does it mean? Is there any way to create client for that (other than JAX-WS 2.O)?

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https://jumpshare.com/b/O5FC6LaBQ6U3UPXjOmX2

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Implementing Asynchronous comm. in WebService & its client

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