On page 362 of JavaServlet Programming by Jason Hunter (the 2nd edition) it says applets can receive RMI callbacks from the web server (servlet). I believe this is the only way to perform a callback. SOAP cannot do callbacks -- correct? In the first edition of his book I believe he said you make RMI use PORT 80 but I can find no mention of this in the second edition. Unfortunately, I no longer have the first edition. Does Applet-Servlet RMI happen on Port 80 and therefor works with Firewalls? Where is this Applet-Servlet RMI documented, anyhow?