[1] SmartUpdate Developer’s Guide ( 版) <http://web.archive.org/web/20040404132747/http://developer.netscape.com/docs/manuals/communicator/jarman/index.htm>
[2] Netscape Gecko and Plugins (Arun Ranganathan 著, 版) <http://petesguide.com/xpi/Netscape%20Gecko%20and%20Plugins.htm>
In Netscape Communicator 4.x browsers, the preferred mechanism for installing plugins was SmartUpdate, which involved signed JAR files (rather like signed CAB files in IE) and JavaScript as the installer-language. This delivery mechanism allowed plugins to be delivered dynamically to end-users, without necessitating a departure from the browser or without restarting the browser. But SmartUpdate is no longer supported in Netscape Gecko-based browsers. Instead, the technology that replaces it is XPInstall (also abbreviated as XPI and pronounced "zippy"). XPInstall is capable of doing everything SmartUpdate could do in Netscape Communicator 4.x