Try to define whether interfaces are shared/client/server only a bit better

Facepunch.Steamworks/SteamApps.cs

@@ -11,7 +11,7 @@ namespace Steamworks
 	/// <summary>
 	/// Exposes a wide range of information and actions for applications and Downloadable Content (DLC).
 	/// </summary>
-	public class SteamApps : SteamClass<SteamApps>
+	public class SteamApps : SteamSharedClass<SteamApps>
 	{
 		internal static ISteamApps Internal => Interface as ISteamApps;
 

Facepunch.Steamworks/SteamFriends.cs

@@ -10,7 +10,7 @@ namespace Steamworks
 	/// <summary>
 	/// Undocumented Parental Settings
 	/// </summary>
-	public class SteamFriends : SteamClass<SteamFriends>
+	public class SteamFriends : SteamClientClass<SteamFriends>
 	{
 		internal static ISteamFriends Internal => Interface as ISteamFriends;
 

Facepunch.Steamworks/SteamInput.cs

@@ -3,7 +3,7 @@ using System.Collections.Generic;
 
 namespace Steamworks
 {
-	public class SteamInput : SteamClass<SteamInput>
+	public class SteamInput : SteamClientClass<SteamInput>
 	{
 		internal static ISteamInput Internal => Interface as ISteamInput;
 

Facepunch.Steamworks/SteamInventory.cs

@@ -12,7 +12,7 @@ namespace Steamworks
 	/// <summary>
 	/// Undocumented Parental Settings
 	/// </summary>
-	public class SteamInventory : SteamClass<SteamInventory>
+	public class SteamInventory : SteamSharedClass<SteamInventory>
 	{
 		internal static ISteamInventory Internal => Interface as ISteamInventory;
 
@@ -28,12 +28,9 @@ namespace Steamworks
 			if ( !server )
 			{
 				Dispatch.Install<SteamInventoryFullUpdate_t>( x => InventoryUpdated( x ) );
-				Dispatch.Install<SteamInventoryDefinitionUpdate_t>( x => LoadDefinitions() );
-			}
-			else
-			{
-				Dispatch.Install<SteamInventoryDefinitionUpdate_t>( x => LoadDefinitions(), true );
 			}
+
+			Dispatch.Install<SteamInventoryDefinitionUpdate_t>( x => LoadDefinitions(), server );
 		}
 
 		private static void InventoryUpdated( SteamInventoryFullUpdate_t x )

Facepunch.Steamworks/SteamMatchmaking.cs

@@ -10,7 +10,7 @@ namespace Steamworks
 	/// <summary>
 	/// Functions for clients to access matchmaking services, favorites, and to operate on game lobbies
 	/// </summary>
-	public class SteamMatchmaking : SteamClass<SteamMatchmaking>
+	public class SteamMatchmaking : SteamClientClass<SteamMatchmaking>
 	{
 		internal static ISteamMatchmaking Internal => Interface as ISteamMatchmaking;
 

Facepunch.Steamworks/SteamMatchmakingServers.cs

@@ -10,7 +10,7 @@ namespace Steamworks
 	/// <summary>
 	/// Functions for clients to access matchmaking services, favorites, and to operate on game lobbies
 	/// </summary>
-	public class SteamMatchmakingServers : SteamClass<SteamMatchmakingServers>
+	public class SteamMatchmakingServers : SteamClientClass<SteamMatchmakingServers>
 	{
 		internal static ISteamMatchmakingServers Internal => Interface as ISteamMatchmakingServers;
 

Facepunch.Steamworks/SteamMusic.cs

@@ -13,7 +13,7 @@ namespace Steamworks
 	/// when an important cut scene is shown, and start playing afterwards.
 	/// Nothing uses Steam Music though so this can probably get fucked
 	/// </summary>
-	public class SteamMusic : SteamClass<SteamMusic>
+	public class SteamMusic : SteamClientClass<SteamMusic>
 	{
 		internal static ISteamMusic Internal => Interface as ISteamMusic;
 

Facepunch.Steamworks/SteamNetworking.cs

@@ -8,7 +8,7 @@ using Steamworks.Data;
 
 namespace Steamworks
 {
-	public class SteamNetworking : SteamClass<SteamNetworking>
+	public class SteamNetworking : SteamSharedClass<SteamNetworking>
 	{
 		internal static ISteamNetworking Internal => Interface as ISteamNetworking;
 

Facepunch.Steamworks/SteamNetworkingSockets.cs

@@ -8,7 +8,7 @@ using Steamworks.Data;
 
 namespace Steamworks
 {
-	public class SteamNetworkingSockets : SteamClass<SteamNetworkingSockets>
+	public class SteamNetworkingSockets : SteamSharedClass<SteamNetworkingSockets>
 	{
 		internal static ISteamNetworkingSockets Internal => Interface as ISteamNetworkingSockets;
 

Facepunch.Steamworks/SteamNetworkingUtils.cs

@@ -10,7 +10,7 @@ namespace Steamworks
 	/// <summary>
 	/// Undocumented Parental Settings
 	/// </summary>
-	public class SteamNetworkingUtils : SteamClass<SteamNetworkingUtils>
+	public class SteamNetworkingUtils : SteamSharedClass<SteamNetworkingUtils>
 	{
 		internal static ISteamNetworkingUtils Internal => Interface as ISteamNetworkingUtils;
 

Facepunch.Steamworks/SteamParental.cs

@@ -10,7 +10,7 @@ namespace Steamworks
 	/// <summary>
 	/// Undocumented Parental Settings
 	/// </summary>
-	public class SteamParental : SteamClass<SteamParental>
+	public class SteamParental : SteamSharedClass<SteamParental>
 	{
 		internal static ISteamParentalSettings Internal => Interface as ISteamParentalSettings;
 

Facepunch.Steamworks/SteamParties.cs

@@ -7,7 +7,7 @@ using Steamworks.Data;
 
 namespace Steamworks
 {
-	public class SteamParties : SteamClass<SteamParties>
+	public class SteamParties : SteamClientClass<SteamParties>
 	{
 		internal static ISteamParties Internal => Interface as ISteamParties;
 

Facepunch.Steamworks/SteamRemoteStorage.cs

@@ -10,7 +10,7 @@ namespace Steamworks
 	/// <summary>
 	/// Undocumented Parental Settings
 	/// </summary>
-	public class SteamRemoteStorage : SteamClass<SteamRemoteStorage>
+	public class SteamRemoteStorage : SteamClientClass<SteamRemoteStorage>
 	{
 		internal static ISteamRemoteStorage Internal => Interface as ISteamRemoteStorage;
 

Facepunch.Steamworks/SteamScreenshots.cs

@@ -10,7 +10,7 @@ namespace Steamworks
 	/// <summary>
 	/// Undocumented Parental Settings
 	/// </summary>
-	public class SteamScreenshots : SteamClass<SteamScreenshots>
+	public class SteamScreenshots : SteamClientClass<SteamScreenshots>
 	{
 		internal static ISteamScreenshots Internal => Interface as ISteamScreenshots;
 

Facepunch.Steamworks/SteamServer.cs

@@ -10,7 +10,7 @@ namespace Steamworks
 	/// <summary>
 	/// Provides the core of the Steam Game Servers API
 	/// </summary>
-	public partial class SteamServer : SteamClass<SteamServer>
+	public partial class SteamServer : SteamServerClass<SteamServer>
 	{
 		internal static ISteamGameServer Internal => Interface as ISteamGameServer;
 

Facepunch.Steamworks/SteamServerStats.cs

@@ -7,7 +7,7 @@ using Steamworks.Data;
 
 namespace Steamworks
 {
-	public class SteamServerStats : SteamClass<SteamServerStats>
+	public class SteamServerStats : SteamServerClass<SteamServerStats>
 	{
 		internal static ISteamGameServerStats Internal => Interface as ISteamGameServerStats;
 

Facepunch.Steamworks/SteamUgc.cs

@@ -12,7 +12,7 @@ namespace Steamworks
 	/// Functions for accessing and manipulating Steam user information.
 	/// This is also where the APIs for Steam Voice are exposed.
 	/// </summary>
-	public class SteamUGC : SteamClass<SteamUGC>
+	public class SteamUGC : SteamSharedClass<SteamUGC>
 	{
 		internal static ISteamUGC Internal => Interface as ISteamUGC;
 

Facepunch.Steamworks/SteamUser.cs

@@ -13,7 +13,7 @@ namespace Steamworks
 	/// Functions for accessing and manipulating Steam user information.
 	/// This is also where the APIs for Steam Voice are exposed.
 	/// </summary>
-	public class SteamUser : SteamClass<SteamUser>
+	public class SteamUser : SteamClientClass<SteamUser>
 	{
 		internal static ISteamUser Internal => Interface as ISteamUser;
 

Facepunch.Steamworks/SteamUserStats.cs

@@ -7,7 +7,7 @@ using Steamworks.Data;
 
 namespace Steamworks
 {
-	public class SteamUserStats : SteamClass<SteamUserStats>
+	public class SteamUserStats : SteamClientClass<SteamUserStats>
 	{
 		internal static ISteamUserStats Internal => Interface as ISteamUserStats;
 

Facepunch.Steamworks/SteamUtils.cs

@@ -10,7 +10,7 @@ namespace Steamworks
 	/// <summary>
 	/// Interface which provides access to a range of miscellaneous utility functions
 	/// </summary>
-	public class SteamUtils : SteamClass<SteamUtils>
+	public class SteamUtils : SteamSharedClass<SteamUtils>
 	{
 		internal static ISteamUtils Internal => Interface as ISteamUtils;
 

Facepunch.Steamworks/SteamVideo.cs

@@ -10,7 +10,7 @@ namespace Steamworks
 	/// <summary>
 	/// Undocumented Parental Settings
 	/// </summary>
-	public class SteamVideo : SteamClass<SteamVideo>
+	public class SteamVideo : SteamClientClass<SteamVideo>
 	{
 		internal static ISteamVideo Internal => Interface as ISteamVideo;
 

Facepunch.Steamworks/Utility/SteamInterface.cs

@@ -59,7 +59,7 @@ namespace Steamworks
 		internal abstract void DestroyInterface( bool server );
 	}
 
-	public class SteamClass<T> : SteamClass
+	public class SteamSharedClass<T> : SteamClass
 	{
 		internal static SteamInterface Interface => InterfaceClient != null ? InterfaceClient : InterfaceServer;
 		internal static SteamInterface InterfaceClient;
@@ -90,4 +90,52 @@ namespace Steamworks
 		}
 	}
 
+	public class SteamClientClass<T> : SteamClass
+	{
+		internal static SteamInterface Interface => InterfaceClient;
+		internal static SteamInterface InterfaceClient;
+
+		internal override void InitializeInterface( bool server )
+		{
+
+		}
+
+		internal virtual void SetInterface( bool server, SteamInterface iface )
+		{
+			if ( server )
+				throw new System.NotSupportedException();
+
+			InterfaceClient = iface;
+		}
+
+		internal override void DestroyInterface( bool server )
+		{
+			InterfaceClient = null;
+		}
+	}	
+	
+	public class SteamServerClass<T> : SteamClass
+	{
+		internal static SteamInterface Interface => InterfaceServer;
+		internal static SteamInterface InterfaceServer;
+
+		internal override void InitializeInterface( bool server )
+		{
+
+		}
+
+		internal virtual void SetInterface( bool server, SteamInterface iface )
+		{
+			if ( !server )
+				throw new System.NotSupportedException();
+
+			InterfaceServer = iface;
+		}
+
+		internal override void DestroyInterface( bool server )
+		{
+			InterfaceServer = null;
+		}
+	}
+
 }