Can anyone out there advise me on the best way to set up a server-client relationship such that the server can send messages to the client at any time to trigger a client response or action. <BR><BR>Obviously I am trying to avoid the need for the client to &#039;poll&#039; the server for waiting messages. Also, I would like to avoid the use of specialist TCP/IP Ports as this causes firewall problems (although I&#039;d be interested in knowing how you handle lower level coms with ASP, but that&#039;s another issue).<BR><BR>Any help, much appreciated.