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diff --git a/common/networksystem/inetworksystem.h b/common/networksystem/inetworksystem.h
new file mode 100644
index 0000000..5a6d602
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+++ b/common/networksystem/inetworksystem.h
@@ -0,0 +1,162 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+//===========================================================================//
+
+#ifndef INETWORKSYSTEM_H
+#define INETWORKSYSTEM_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+#include "tier0/platform.h"
+#include "appframework/IAppSystem.h"
+
+
+//-----------------------------------------------------------------------------
+// Forward declarations: 
+//-----------------------------------------------------------------------------
+class INetworkMessageHandler;
+class INetworkMessage;
+class INetChannel;
+class INetworkMessageFactory;
+class bf_read;
+class bf_write;
+typedef struct netadr_s netadr_t;
+class CNetPacket;
+
+
+//-----------------------------------------------------------------------------
+// Default ports
+//-----------------------------------------------------------------------------
+enum
+{
+	NETWORKSYSTEM_DEFAULT_SERVER_PORT = 27001,
+	NETWORKSYSTEM_DEFAULT_CLIENT_PORT = 27002
+};
+
+
+//-----------------------------------------------------------------------------
+// This interface encompasses a one-way communication path between two
+//-----------------------------------------------------------------------------
+typedef int ConnectionHandle_t;
+
+enum ConnectionStatus_t
+{
+	CONNECTION_STATE_DISCONNECTED = 0,
+	CONNECTION_STATE_CONNECTING,
+	CONNECTION_STATE_CONNECTION_FAILED,
+	CONNECTION_STATE_CONNECTED,
+};
+
+
+//-----------------------------------------------------------------------------
+// This interface encompasses a one-way communication path between two machines
+//-----------------------------------------------------------------------------
+abstract_class INetChannel
+{
+public:
+//	virtual INetworkMessageHandler *GetMsgHandler( void ) const = 0;
+	virtual const netadr_t	&GetRemoteAddress( void ) const = 0;
+
+	// send a net message
+	// NOTE: There are special connect/disconnect messages?
+	virtual bool AddNetMsg( INetworkMessage *msg, bool bForceReliable = false ) = 0; 
+//	virtual bool RegisterMessage( INetworkMessage *msg ) = 0;
+
+	virtual ConnectionStatus_t GetConnectionState( ) = 0;
+
+/*
+	virtual ConnectTo( const netadr_t& to ) = 0;
+	virtual Disconnect() = 0;
+
+	virtual const netadr_t& GetLocalAddress() = 0;
+
+	virtual const netadr_t& GetRemoteAddress() = 0;
+*/
+};
+
+
+//-----------------------------------------------------------------------------
+// Network event types + structures
+//-----------------------------------------------------------------------------
+enum NetworkEventType_t
+{
+	NETWORK_EVENT_CONNECTED = 0,
+	NETWORK_EVENT_DISCONNECTED,
+	NETWORK_EVENT_MESSAGE_RECEIVED,
+};
+
+struct NetworkEvent_t
+{
+	NetworkEventType_t m_nType;
+};
+
+struct NetworkConnectionEvent_t : public NetworkEvent_t
+{
+	INetChannel *m_pChannel;
+};
+
+struct NetworkDisconnectionEvent_t : public NetworkEvent_t
+{
+	INetChannel *m_pChannel;
+};
+
+struct NetworkMessageReceivedEvent_t : public NetworkEvent_t
+{
+	INetChannel *m_pChannel;
+	INetworkMessage *m_pNetworkMessage;
+};
+
+
+//-----------------------------------------------------------------------------
+// Main interface for low-level networking (packet sending). This is a low-level interface
+//-----------------------------------------------------------------------------
+#define NETWORKSYSTEM_INTERFACE_VERSION	"NetworkSystemVersion001"
+abstract_class INetworkSystem : public IAppSystem
+{
+public:
+	// Installs network message factories to be used with all connections
+	virtual bool RegisterMessage( INetworkMessage *msg ) = 0;
+
+	// Start, shutdown a server
+	virtual bool StartServer( unsigned short nServerListenPort = NETWORKSYSTEM_DEFAULT_SERVER_PORT ) = 0;
+	virtual void ShutdownServer( ) = 0;
+
+	// Process server-side network messages
+	virtual void ServerReceiveMessages() = 0;
+	virtual void ServerSendMessages() = 0;
+
+	// Start, shutdown a client
+	virtual bool StartClient( unsigned short nClientListenPort = NETWORKSYSTEM_DEFAULT_CLIENT_PORT ) = 0;
+	virtual void ShutdownClient( ) = 0;
+
+	// Process client-side network messages
+	virtual void ClientSendMessages() = 0;
+	virtual void ClientReceiveMessages() = 0;
+
+	// Connect, disconnect a client to a server
+	virtual INetChannel* ConnectClientToServer( const char *pServer, int nServerListenPort = NETWORKSYSTEM_DEFAULT_SERVER_PORT ) = 0;
+	virtual void DisconnectClientFromServer( INetChannel* pChan ) = 0;
+
+	// Event queue
+	virtual NetworkEvent_t *FirstNetworkEvent( ) = 0;
+	virtual NetworkEvent_t *NextNetworkEvent( ) = 0;
+
+	// Returns the local host name
+	virtual const char* GetLocalHostName( void ) const = 0;
+	virtual const char* GetLocalAddress( void ) const = 0;
+
+	/*
+	// NOTE: Server methods
+	// NOTE: There's only 1 client INetChannel ever
+	// There can be 0-N server INetChannels.
+	virtual INetChannel* CreateConnection( bool bIsClientConnection ) = 0;
+
+	// Add methods for setting unreliable payloads
+	*/
+};
+
+
+#endif // INETWORKSYSTEM_H