diff --git a/core/modules/server/server.js b/core/modules/server/server.js
index 258ddfa31..65fc6d475 100644
--- a/core/modules/server/server.js
+++ b/core/modules/server/server.js
@@ -43,6 +43,14 @@ function Server(options) {
 			}
 		}
 	}
+	// Register server extensions
+	this.extensions = [];
+	$tw.modules.forEachModuleOfType("server-extension",function(title,exports) {
+		var extension = new exports.Extension(self);
+		self.extensions.push(extension);
+	});
+	// Initialise server extensions
+	this.invokeExtensionHook("server-start-initialisation");
 	// Setup the default required plugins
 	this.requiredPlugins = this.get("required-plugins").split(',');
 	// Initialise CSRF
@@ -96,8 +104,16 @@ function Server(options) {
 	this.servername = $tw.utils.transliterateToSafeASCII(this.get("server-name") || this.wiki.getTiddlerText("$:/SiteTitle") || "TiddlyWiki5");
 	this.boot.origin = this.get("origin")? this.get("origin"): this.protocol+"://"+this.get("host")+":"+this.get("port");
 	this.boot.pathPrefix = this.get("path-prefix") || "";
+	// Complete initialisation of server extensions
+	this.invokeExtensionHook("server-completed-initialisation");
 }
 
+Server.prototype.invokeExtensionHook = function(hookName) {
+	$tw.utils.each(this.extensions,function(extension) {
+		extension.hook(hookName);
+	});
+};
+
 /*
 Send a response to the client. This method checks if the response must be sent
 or if the client alrady has the data cached. If that's the case only a 304
diff --git a/plugins/tiddlywiki/multiwikiserver/modules/server-extension.js b/plugins/tiddlywiki/multiwikiserver/modules/server-extension.js
new file mode 100644
index 000000000..41be69f00
--- /dev/null
+++ b/plugins/tiddlywiki/multiwikiserver/modules/server-extension.js
@@ -0,0 +1,25 @@
+/*\
+title: $:/plugins/tiddlywiki/multiwikiserver/server-extension.js
+type: application/javascript
+module-type: server-extension
+
+Multi wiki server extension for the core server object
+
+\*/
+(function(){
+
+/*jslint node: true, browser: true */
+/*global $tw: false */
+"use strict";
+
+function Extension(server) {
+	this.server = server;
+}
+
+Extension.prototype.hook = function(name) {
+	
+};
+
+exports.Extension = Extension;
+
+})();