how to implement “server push ” on apache-php-mysql machine?
<p>here is the question:
    when one user upload something to the server(apache).
the server will " push " the request data to all the users .
  and I don't want to use "ajax" or javascript "timeout reload"。
It costs a lot 
  so, Is there any javascript lib can implement the "server push" technology?</p>
