If anyone is haboring an urge to write an MCL plug-in to Netscape, here is some recent documentation on how to do it, http://home.netscape.com/eng/mozilla/3.0/handbook/plugins/index.html What one probably wants is a plug-in that knows how to communicate with MCL, say via Apple Events at first, rather than trying to coerce MCL into running as a plugin. The communications protocol should model the plugin API.