diff --git a/OpenRa.Game/OrderManager.cs b/OpenRa.Game/OrderManager.cs
new file mode 100755
index 0000000000..e7b9bb83f7
--- /dev/null
+++ b/OpenRa.Game/OrderManager.cs
@@ -0,0 +1,108 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.IO;
+using System.Net;
+using IjwFramework.Types;
+
+namespace OpenRa.Game
+{
+	class OrderManager
+	{
+		BinaryWriter savingReplay;
+		List<OrderSource> players;
+		int frameNumber = 0;
+
+		public OrderManager( IEnumerable<OrderSource> players )
+		{
+			this.players = players.ToList();
+		}
+
+		public OrderManager( IEnumerable<OrderSource> players, string replayFilename )
+			: this( players )
+		{
+			savingReplay = new BinaryWriter( new FileStream( replayFilename, FileMode.Create ) );
+		}
+
+		public void Tick()
+		{
+			var localOrders = Game.controller.GetRecentOrders();
+			foreach( var p in players )
+				p.Tick( localOrders );
+
+			if( savingReplay != null )
+				savingReplay.Write( frameNumber );
+
+			foreach( var p in players )
+			{
+				foreach( var order in p.OrdersForFrame( frameNumber ) )
+				{
+					UnitOrders.ProcessOrder( order );
+					if( savingReplay != null )
+						savingReplay.Write( order.Serialize() );
+				}
+			}
+			++frameNumber;
+		}
+	}
+
+	interface OrderSource
+	{
+		void Tick( List<Order> localOrders );
+		List<Order> OrdersForFrame( int frameNumber );
+	}
+
+	class LocalOrderSource : OrderSource
+	{
+		List<Order> orders;
+
+		public void Tick( List<Order> localOrders )
+		{
+			orders = localOrders;
+		}
+
+		public List<Order> OrdersForFrame( int frameNumber )
+		{
+			return orders;
+		}
+	}
+
+	class ReplayOrderSource : OrderSource
+	{
+		BinaryReader replayReader;
+		public ReplayOrderSource( string replayFilename )
+		{
+			replayReader = new BinaryReader( File.Open( replayFilename, FileMode.Open ) );
+			replayReader.ReadUInt32();
+		}
+
+		public void Tick( List<Order> localOrders )
+		{
+		}
+
+		public List<Order> OrdersForFrame( int frameNumber )
+		{
+			var ret = new List<Order>();
+			while( true )
+			{
+				try
+				{
+					var first = replayReader.ReadUInt32();
+					var order = Order.Deserialize( replayReader, first );
+					if( order == null )
+					{
+						if( (uint)frameNumber + 1 != first )
+							throw new NotImplementedException();
+						return ret;
+					}
+					ret.Add( order );
+				}
+				catch( EndOfStreamException )
+				{
+					return ret;
+				}
+			}
+		}
+	}
+}