Why seleton and are web service push technology?

[niksa_os]

1) For what reason skeleton classes exist, I mean the ability to generate this classes? If I have java class I use axis and make wsdl and client stub. Why skeleton classes? 2) Are web service push technology  or does it can be? I make web service client and I want that client get new data whenever data change at the server. This can be done with web service? If not, how this can be done? I can't manage server, I can only get data. Thanks.