diff --git a/lib/Ratchet/Application/WAMP/App.php b/lib/Ratchet/Application/WAMP/App.php
index f726460..6d9c002 100644
--- a/lib/Ratchet/Application/WAMP/App.php
+++ b/lib/Ratchet/Application/WAMP/App.php
@@ -127,6 +127,8 @@ class App implements WebSocketAppInterface {
     }
 
     /**
+     * If the developer's application as set some server-to-client prefixes to be set,
+     * this method ensures those are taxied to the next outgoing message
      * @param Ratchet\Resource\Command\CommandInterface|NULL
      * @return Ratchet\Resource\Command\Composite
      */
diff --git a/lib/Ratchet/Application/WAMP/Command/Action/CallError.php b/lib/Ratchet/Application/WAMP/Command/Action/CallError.php
new file mode 100644
index 0000000..afba2b2
--- /dev/null
+++ b/lib/Ratchet/Application/WAMP/Command/Action/CallError.php
@@ -0,0 +1,31 @@
+<?php
+namespace Ratchet\Application\WAMP\Command\Action;
+use Ratchet\Resource\Command\Action\SendMessage;
+
+class CallError extends SendMessage {
+    protected $_id;
+
+    protected $_uri;
+
+    protected $_desc;
+
+    public function setError($callId, $uri, $desc) {
+        $this->_id   = $callId;
+        $this->_uri  = $uri;
+        $this->_desc = $desc;
+
+        return $this->setMessage(json_encode(array(4, $callId, $uri, $desc)));
+    }
+
+    public function getId() {
+        return $this->_id;
+    }
+
+    public function getUri() {
+        return $this->_uri;
+    }
+
+    public function getDescription() {
+        return $this->_desc;
+    }
+}
\ No newline at end of file
diff --git a/lib/Ratchet/Application/WAMP/Command/Action/CallResult.php b/lib/Ratchet/Application/WAMP/Command/Action/CallResult.php
new file mode 100644
index 0000000..5e41a8a
--- /dev/null
+++ b/lib/Ratchet/Application/WAMP/Command/Action/CallResult.php
@@ -0,0 +1,26 @@
+<?php
+namespace Ratchet\Application\WAMP\Command\Action;
+use Ratchet\Resource\Command\Action\SendMessage;
+
+/**
+ */
+class CallResult extends SendMessage {
+    protected $_id;
+
+    protected $_data;
+
+    public function setResult($callId, array $data = array()) {
+        $this->_id   = $callId;
+        $this->_data = $data;
+
+        return $this->setMessage(json_encode(array(3, $callId, $data)));
+    }
+
+    public function getId() {
+        return $this->_id;
+    }
+
+    public function getData() {
+        return $this->_data;
+    }
+}
\ No newline at end of file
diff --git a/lib/Ratchet/Application/WAMP/Command/Action/Prefix.php b/lib/Ratchet/Application/WAMP/Command/Action/Prefix.php
index 56a5d00..627dce2 100644
--- a/lib/Ratchet/Application/WAMP/Command/Action/Prefix.php
+++ b/lib/Ratchet/Application/WAMP/Command/Action/Prefix.php
@@ -3,6 +3,9 @@ namespace Ratchet\Application\WAMP\Command\Action;
 use Ratchet\Resource\Command\Action\SendMessage;
 
 /**
+ * Send a curie to uri mapping to the client
+ * Both sides will agree to send the curie, representing the uri,
+ * resulting in less data transfered
  */
 class Prefix extends SendMessage {
     protected $_curie;