var lRes = lWSC.rpc(
    "testpanel.server.jwebsocket.rpc.RpcTime",
    "getTime",
     null, //parameter OF the called method, here null because we don't have any arguments
      {  spawnThread: false,
     OnResponse: function( aToken ) {
         if( aToken.code != 0 ) {
             alert( "RPC Error: " + aToken.msg );
         } else {
             var lRes = aToken.result;
                 alert( "server time: " + lRes );
         }
      }
     }
  );