      *  specific message instance.
      *  Core header names begin with a 'DS' prefix. Custom header names should start 
      *  with a unique prefix to avoid name collisions.
+     *  
+     *  @langversion 3.0
+     *  @playerversion Flash 9
+     *  @playerversion AIR 1.1
+     *  @productversion BlazeDS 4
+     *  @productversion LCDS 3 
      */
     public function get headers():Object
     {

     *  message expiration.
     *
     *  @see #timeToLive
     */
    public function get timestamp():Number
    {

	 *  channels and the value controls how long the corresponding MessageResponder 
	 *  will wait for an acknowledgement, result or fault response for the message
	 *  before timing out the request.
	 *  
	 *  @langversion 3.0
	 *  @playerversion Flash 9
	 *  @playerversion AIR 1.1
	 *  @productversion BlazeDS 4
	 *  @productversion LCDS 3 
	 */
	public static const REQUEST_TIMEOUT_HEADER:String = "DSRequestTimeout";	

