     /**
      * Making only one request at a time is allowed on the method; additional requests made 
      * while a request is outstanding are immediately faulted on the client and are not sent to the server.
+     *  
+     *  @langversion 3.0
+     *  @playerversion Flash 9
+     *  @playerversion AIR 1.1
+     *  @productversion Flex 3
      */
     public static const SINGLE:String = "single";
 }

/**
 * Concurrency is set via MXML based access to RPC services to indicate how to handle multiple
 * calls to the same service. The default concurrency value is <code>multiple</code>.
 */
public final class Concurrency
{

     * Only the result or fault for the most recent request will be dispatched on the client. 
     * This may simplify event handling in the client application, but care should be taken to only use 
     * this mode when results or faults for requests may be safely ignored.
     *  
     *  @langversion 3.0
     *  @playerversion Flash 9
     *  @playerversion AIR 1.1
     *  @productversion Flex 3
     */
    public static const LAST:String = "last";

    /**
     * Existing requests are not cancelled, and the developer is responsible for ensuring
     * the consistency of returned data by carefully managing the event stream.
     *  
     *  @langversion 3.0
     *  @playerversion Flash 9
     *  @playerversion AIR 1.1
     *  @productversion Flex 3
     */
    public static const MULTIPLE:String = "multiple";

