Something

Index: Services/WCell.RealmServer/Network/RealmServer.cs
===================================================================
--- Services/WCell.RealmServer/Network/RealmServer.cs	(revision 223)
+++ Services/WCell.RealmServer/Network/RealmServer.cs	(working copy)
@@ -289,12 +289,12 @@
 					// Reconnect instead!
                     m_authServiceClient.Channel.UpdateRealmServer(m_realmID, m_configuration.ServerName,
                                                        ((IPEndPoint)m_tcpListen.LocalEndPoint).ToString(),
-                                                       WorldMgr.ServerPopulation, 0, 0, 1, 0);
+                                                       WorldMgr.ServerPopulation, 0, 0, 1, WorldMgr.IsLocked);
 
                     if (Configuration.RegisterOutsideAddress)
                     {
                         m_authServiceClient.Channel.UpdateRealmServer(m_outsideRealmID, m_configuration.OutsideServerName, string.Format("{0}:{1}", Configuration.OutsideAddress, Configuration.Port.ToString()),
-                                                       WorldMgr.ServerPopulation, 0, 0, 1, 0);
+                                                       WorldMgr.ServerPopulation, 0, 0, 1, WorldMgr.IsLocked);
                     }
                 }
             }
@@ -463,7 +463,16 @@
         }
 
         #endregion
-
+        public static void LockRealm()
+        {
+            WorldMgr.IsLocked = 1;
+            WorldMgr.Broadcast("Realm has been locked!");
+        }
+        public static void UnlockRealm()
+        {
+            WorldMgr.IsLocked = 0;
+            WorldMgr.Broadcast("Realm has been unlocked!");
+        }
         #region Send methods
 
         /// <summary>
Index: Services/WCell.RealmServer/World/WorldMgr.cs
===================================================================
--- Services/WCell.RealmServer/World/WorldMgr.cs	(revision 223)
+++ Services/WCell.RealmServer/World/WorldMgr.cs	(working copy)
@@ -163,6 +163,10 @@
 				return (Characters.Count > capacity * 0.75 ? 1.7f : (Characters.Count > capacity / 3 ? 1.6f : 1.5f));
 			}
 		}
+        /// <summary>
+        /// Determines if the server has been locked or not
+        /// </summary>
+        public static int IsLocked = 0;
 
 		#endregion