How To?? asynch call webservice

[Suresh]

Hi All,           How does the                                     1) executeRequestResponseAsync(WSIFMessage input)                 and                 2) executeRequestResponseAsyncWSIFMessage input,                                                      WSIFResponseHandler handler).           work??.                                 I understand that executeRequestResponseAsync with a handler, handles the response in a different thread of execution from the original                 request.The second executeRequestResponseAsync has handler registered for call back and returns a correlation id.                   What do i do with the id that i get back??.                   How does the first executeRequestResponseAsync work with fireAsyncResponse and processAsyncResponse methods??.                   How does WSIF handle document type services.                                 Does some part of WSDL describe that a particular service has to be executed asynhcronously??.                   Where can i find more of asych invocation in axis    Thanks a million in advance   suresh