diff --git a/js/GUI/Screen/Login.js b/js/GUI/Screen/Login.js
index f5763e6..1d4f2e1 100644
--- a/js/GUI/Screen/Login.js
+++ b/js/GUI/Screen/Login.js
@@ -29,7 +29,11 @@ function initLogin() {
 	loginForm.join.value = I18n.get('join');
 	loginForm.addEventListener('submit', function(e) {
 		e.preventDefault();
-		Session.start(loginForm.you.value);
+		if(!Session.isLoggedIn()) {
+			Session.start(loginForm.you.value);
+		} else {
+			Messaging.send({tag: 'Hello', name: loginForm.you.value});
+		}
 	});
 	loginForm.you.addEventListener("input", validate);
 }
diff --git a/js/Session.js b/js/Session.js
index df54a7a..afbc293 100644
--- a/js/Session.js
+++ b/js/Session.js
@@ -17,6 +17,8 @@ Messaging.addEventListener(["LogIn"], function(o) {
 	}
 });
 
+Messaging.addEventListener('close', function() {loggedIn = false;});
+
 return {
 	is: is,
 	getKey: getKey,