diff --git a/src/gui/display-interface-proxy.cpp b/src/common/display-interface-proxy.cpp
similarity index 80%
rename from src/gui/display-interface-proxy.cpp
rename to src/common/display-interface-proxy.cpp
index 96a79290b..30d74a507 100644
--- a/src/gui/display-interface-proxy.cpp
+++ b/src/common/display-interface-proxy.cpp
@@ -30,7 +30,7 @@
  ** @see display-facade.hpp
  ** @see display-service.hpp actual implementation within the GUI
  ** @deprecated obsolete early design draft from 2009;
- **             as of 2018 only kept in source to compile some likewise obsolete UI widgets. 
+ **             as of 2018 only kept in source to compile some likewise obsolete UI widgets.
  */
 
 
@@ -48,6 +48,9 @@ namespace lumiera {
   /// emit the vtable here into this translation unit within liblumieracommon.so...
   Display::~Display()      { }
   
+  /** static storage for the facade access front-end */
+  lib::Depend<Display> Display::facade;
+  
 } // namespace lumiera
 
 
@@ -55,14 +58,12 @@ namespace lumiera {
 namespace lumiera {
 namespace facade {
   
-  typedef InstanceHandle< LUMIERA_INTERFACE_INAME(lumieraorg_Display, 0)
-                        , lumiera::Display
-                        > IHandle_Display;
-  
-  
+  using IHandle = InstanceHandle< LUMIERA_INTERFACE_INAME(lumieraorg_Display, 0)
+                                , lumiera::Display
+                                >;
   template<>
-  class Proxy<IHandle_Display>
-    : public Binding<IHandle_Display>
+  class Proxy<IHandle>
+    : public Binding<IHandle>
     {
       //----Proxy-Implementation-of-lumiera::Display--------
       
@@ -84,7 +85,12 @@ namespace facade {
     };
   
   
-//  template  void openProxy<IHandle_Display>  (IHandle_Display const&);
-//  template  void closeProxy<IHandle_Display> (void);
-  
-}} // namespace lumiera::facade
+} //namespace facade
+
+
+// emit code for the proxy implementation here...
+template
+class InstanceHandle< LUMIERA_INTERFACE_INAME(lumieraorg_Display, 0)
+                    , lumiera::Display
+                    >;
+} // namespace lumiera
diff --git a/src/common/instancehandle.hpp b/src/common/instancehandle.hpp
index c57170791..fdfd9470d 100644
--- a/src/common/instancehandle.hpp
+++ b/src/common/instancehandle.hpp
@@ -127,7 +127,6 @@ namespace lumiera {
       : ServiceHandle<I,FA>
       {
         using IH = InstanceHandle<I,FA>;
-        using SH = ServiceHandle<I,FA>;
         
         Link (IH const& iha);
        ~Link ();
@@ -148,7 +147,7 @@ namespace lumiera {
         using IH = InstanceHandle<I,I>;
         IH& ih_;
         
-        Link (IH const& ih)
+        Link (IH& ih)
           : ih_{ih}
         { }
         
@@ -227,7 +226,7 @@ namespace lumiera {
       
       /** act as smart pointer providing access through the facade.
        *  @note we don't provide operator*                      */
-      FA * operator-> ()  const { return facadeLink_; }
+      FA * operator-> ()  const { return facadeLink_.operator ->(); }
       
       /** directly access the instance via the CL interface */
       I& get ()  const { ENSURE(instance_); return *instance_; }
diff --git a/src/gui/notification-interface-proxy.cpp b/src/common/notification-interface-proxy.cpp
similarity index 79%
rename from src/gui/notification-interface-proxy.cpp
rename to src/common/notification-interface-proxy.cpp
index f75d7b431..5debc71ab 100644
--- a/src/gui/notification-interface-proxy.cpp
+++ b/src/common/notification-interface-proxy.cpp
@@ -40,19 +40,22 @@
 #include "include/gui-notification-facade.h"
 #include "include/interfaceproxy.hpp"
 
+namespace gui {
+  /** static storage for the facade access front-end */
+  lib::Depend<GuiNotification> GuiNotification::facade;
+}
 namespace lumiera {
 namespace facade {
   using gui::ID;
   using lib::diff::MutationMessage;
   
-  typedef InstanceHandle< LUMIERA_INTERFACE_INAME(lumieraorg_GuiNotification, 0)
-                        , gui::GuiNotification
-                        > IHandle_GuiNotification;
   
-  
-  template
-  class Proxy<IHandle_GuiNotification>
-    : public Binding<IHandle_GuiNotification>
+  using IHandle = InstanceHandle< LUMIERA_INTERFACE_INAME(lumieraorg_GuiNotification, 0)
+                                , gui::GuiNotification
+                                >;
+  template<>
+  class Proxy<IHandle>
+    : public Binding<IHandle>
     {
       using Level = gui::NotifyLevel;
       
@@ -69,9 +72,12 @@ namespace facade {
       using IBinding::IBinding;
     };
   
-  
-//  template  void openProxy<IHandle_GuiNotification>  (IHandle_GuiNotification const&);
-//  template  void closeProxy<IHandle_GuiNotification> (void);
-  
-  
-}} // namespace lumiera::facade
+} //namespace facade
+
+
+// emit code for the proxy implementation here...
+template
+class InstanceHandle< LUMIERA_INTERFACE_INAME(lumieraorg_GuiNotification, 0)
+                    , gui::GuiNotification
+                    >;
+} // namespace lumiera
diff --git a/src/gui/display-service.cpp b/src/gui/display-service.cpp
index 3a84b573a..0aa975c59 100644
--- a/src/gui/display-service.cpp
+++ b/src/gui/display-service.cpp
@@ -120,7 +120,7 @@ namespace gui {
     
     
     
-    using lumiera::facade::LUMIERA_ERROR_FACADE_LIFECYCLE;
+    using lumiera::error::LERR_(LIFECYCLE);
     
     lib::Depend<DisplayService> _instance; ///< a backdoor for the C Language impl to access the actual SessionCommand implementation...
     
@@ -136,7 +136,7 @@ namespace gui {
                                                              { 
                                                                if (!_instance)
                                                                  { 
-                                                                   lumiera_error_set(LUMIERA_ERROR_FACADE_LIFECYCLE, 0);
+                                                                   lumiera_error_set (LUMIERA_ERROR_LIFECYCLE, 0);
                                                                    return;
                                                                  }
                                                                
@@ -153,7 +153,7 @@ namespace gui {
                                                              { 
                                                                if (!_instance)
                                                                  { 
-                                                                   lumiera_error_set(LUMIERA_ERROR_FACADE_LIFECYCLE, 0);
+                                                                   lumiera_error_set (LUMIERA_ERROR_LIFECYCLE, 0);
                                                                    return;
                                                                  }
                                                                
diff --git a/src/gui/notification-service.cpp b/src/gui/notification-service.cpp
index 76d47b5a0..4a30fcdf3 100644
--- a/src/gui/notification-service.cpp
+++ b/src/gui/notification-service.cpp
@@ -209,7 +209,7 @@ namespace gui {
     
     
     
-    using lumiera::facade::LUMIERA_ERROR_FACADE_LIFECYCLE;
+    using lumiera::error::LERR_(LIFECYCLE);
     
     lib::Depend<NotificationService> _instance; ///< a backdoor for the C Language impl to access the actual SessionCommand implementation...
     
@@ -223,7 +223,7 @@ namespace gui {
                                , LUMIERA_INTERFACE_INLINE (displayInfo,
                                                            void, (uint severity, const char* text),
                                                              {
-                                                               if (!_instance) lumiera_error_set(LUMIERA_ERROR_FACADE_LIFECYCLE, text);
+                                                               if (!_instance) lumiera_error_set (LUMIERA_ERROR_LIFECYCLE, text);
                                                                else
                                                                  _instance().displayInfo (NotifyLevel(severity), text);
                                                              }
@@ -231,7 +231,7 @@ namespace gui {
                                , LUMIERA_INTERFACE_INLINE (markError,
                                                            void, (LumieraUid element, const char* text),
                                                              {
-                                                               if (!_instance) lumiera_error_set(LUMIERA_ERROR_FACADE_LIFECYCLE, text);
+                                                               if (!_instance) lumiera_error_set (LUMIERA_ERROR_LIFECYCLE, text);
                                                                else
                                                                  _instance().markError (reinterpret_cast<ID> (*element), text);
                                                              }
@@ -239,7 +239,7 @@ namespace gui {
                                , LUMIERA_INTERFACE_INLINE (markNote,
                                                            void, (LumieraUid element, const char* text),
                                                              {
-                                                               if (!_instance) lumiera_error_set(LUMIERA_ERROR_FACADE_LIFECYCLE, text);
+                                                               if (!_instance) lumiera_error_set (LUMIERA_ERROR_LIFECYCLE, text);
                                                                else
                                                                  _instance().markNote (reinterpret_cast<ID> (*element), text);
                                                              }
@@ -247,7 +247,7 @@ namespace gui {
                                , LUMIERA_INTERFACE_INLINE (mutate,
                                                            void, (LumieraUid element, void* diff),
                                                              {
-                                                               if (!_instance) lumiera_error_set(LUMIERA_ERROR_FACADE_LIFECYCLE, "passing diff message");
+                                                               if (!_instance) lumiera_error_set (LUMIERA_ERROR_LIFECYCLE, "passing diff message");
                                                                else
                                                                  _instance().mutate (reinterpret_cast<ID> (*element), move(*reinterpret_cast<MutationMessage*> (diff)));
                                                              }
@@ -255,7 +255,7 @@ namespace gui {
                                , LUMIERA_INTERFACE_INLINE (triggerGuiShutdown,
                                                            void, (const char* cause),
                                                              {
-                                                               if (!_instance) lumiera_error_set(LUMIERA_ERROR_FACADE_LIFECYCLE, cause);
+                                                               if (!_instance) lumiera_error_set (LUMIERA_ERROR_LIFECYCLE, cause);
                                                                else
                                                                  _instance().triggerGuiShutdown (cause);
                                                              }
diff --git a/src/include/display-facade.h b/src/include/display-facade.h
index 21f2d35ca..270dc6172 100644
--- a/src/include/display-facade.h
+++ b/src/include/display-facade.h
@@ -118,8 +118,7 @@ namespace lumiera {
       virtual Sink getHandle(LumieraDisplaySlot)   =0;
       
       
-    protected:
-      virtual ~Display();
+      virtual ~Display();  ///< this is an interface
     };
   
   
diff --git a/src/include/dummy-player-facade.h b/src/include/dummy-player-facade.h
index cd26970e7..1fc72eec2 100644
--- a/src/include/dummy-player-facade.h
+++ b/src/include/dummy-player-facade.h
@@ -131,6 +131,7 @@ namespace lumiera {
         
       protected:
         virtual ~DummyPlayer();
+        friend class lib::DependencyFactory<DummyPlayer>;
       };
     
     
diff --git a/src/include/gui-notification-facade.h b/src/include/gui-notification-facade.h
index 3a6de7446..2ebee467d 100644
--- a/src/include/gui-notification-facade.h
+++ b/src/include/gui-notification-facade.h
@@ -76,6 +76,10 @@ namespace gui {
    */
   class GuiNotification
     {
+    protected:
+      virtual ~GuiNotification() {}   ///< this is an interface
+      friend class lib::DependencyFactory<GuiNotification>;
+      
     public:
       static lib::Depend<GuiNotification> facade;
       
@@ -108,9 +112,6 @@ namespace gui {
        */
       virtual void triggerGuiShutdown (string const& cause)      =0;
       
-      
-    protected:
-      virtual ~GuiNotification() {}
     };
     
   
diff --git a/src/include/interfaceproxy.hpp b/src/include/interfaceproxy.hpp
index 0e1277356..c9404922c 100644
--- a/src/include/interfaceproxy.hpp
+++ b/src/include/interfaceproxy.hpp
@@ -93,9 +93,11 @@
 #define LUMIERA_INTERFACE_PROXY_H
 
 
-#include "lib/error.hpp"
 #include "common/instancehandle.hpp"
+#include "lib/error.hpp"
+#include "lib/util.hpp"
 
+using util::cStr;
 
 namespace lumiera {
 namespace facade {
@@ -114,13 +116,12 @@ namespace facade {
    * to the service lifecycle.
    */
   template<class IHA>
-  class Binding;
+  struct Binding;
   
   template<class FA, class I>
-  class Binding<InstanceHandle<I,FA>>
+  struct Binding<InstanceHandle<I,FA>>
     : public FA
     {
-    protected:
       typedef InstanceHandle<I,FA> IHandle;
       typedef Binding<IHandle> IBinding;
       
@@ -132,6 +133,25 @@ namespace facade {
     };
   
   
+  
+  template<class I, class FA>
+  Link<I,FA>::Link (IH const& iha)
+    : ServiceHandle<I,FA>{iha}
+    { }
+  
+  template<class I, class FA>
+  Link<I,FA>::~Link() { }
+  
+  
+  template<class I, class FA>
+  FA*
+  Link<I,FA>::operator->()  const
+  {
+    return ServiceHandle<I,FA>::operator->();
+  }
+
+  
+  
 }} // namespace lumiera::facade
 
 #endif
diff --git a/src/include/play-facade.hpp b/src/include/play-facade.hpp
index dfe141c64..abf8188d2 100644
--- a/src/include/play-facade.hpp
+++ b/src/include/play-facade.hpp
@@ -81,6 +81,9 @@ namespace lumiera {
      */
     class Play
       {
+      protected:
+        virtual ~Play();
+        friend class lib::DependencyFactory<Play>;
       public:
         
         /** get an implementation instance of this service */
@@ -145,8 +148,6 @@ namespace lumiera {
         Controller perform(Clip);
         
       protected:
-        virtual ~Play();
-        
         /** core operation: create a new playback process
          *  outputting to the given viewer/display  */
         virtual Controller connect(ModelPorts, Output)      =0;
diff --git a/src/include/session-command-facade.h b/src/include/session-command-facade.h
index 787d42a1e..fee2c54c1 100644
--- a/src/include/session-command-facade.h
+++ b/src/include/session-command-facade.h
@@ -109,7 +109,8 @@ namespace control {
       
       
     protected:
-      virtual ~SessionCommand() {}
+      virtual ~SessionCommand() {} ///< this is an interface
+      friend class lib::DependencyFactory<SessionCommand>;
     };
     
   
diff --git a/src/proc/control/session-command-interface-proxy.cpp b/src/proc/control/session-command-interface-proxy.cpp
index c054e3ba0..518f93a2c 100644
--- a/src/proc/control/session-command-interface-proxy.cpp
+++ b/src/proc/control/session-command-interface-proxy.cpp
@@ -40,17 +40,22 @@
 #include "include/session-command-facade.h"
 #include "include/interfaceproxy.hpp"
 
+namespace proc {
+namespace control{
+  /** static storage for the facade access front-end */
+  lib::Depend<SessionCommand> SessionCommand::facade;
+}}
 namespace lumiera {
 namespace facade {
   
-  typedef InstanceHandle< LUMIERA_INTERFACE_INAME(lumieraorg_SessionCommand, 0)
-                        , proc::control::SessionCommand
-                        > IHandle_SessionCommand;
+  using IHandle = InstanceHandle< LUMIERA_INTERFACE_INAME(lumieraorg_SessionCommand, 0)
+                                , proc::control::SessionCommand
+                                >;
   
   
   template<>
-  class Proxy<IHandle_SessionCommand>
-    : public Binding<IHandle_SessionCommand>
+  class Proxy<IHandle>
+    : public Binding<IHandle>
     {
       //----Proxy-Implementation-of-SessionCommand--------
       
@@ -64,9 +69,12 @@ namespace facade {
       using IBinding::IBinding;
     };
   
-  
-//  template  void openProxy<IHandle_SessionCommand>  (IHandle_SessionCommand const&);
-//  template  void closeProxy<IHandle_SessionCommand> (void);
-  
-  
-}} // namespace lumiera::facade
+} //namespace facade
+
+
+// emit code for the proxy implementation here...
+template
+class InstanceHandle< LUMIERA_INTERFACE_INAME(lumieraorg_SessionCommand, 0)
+                    , proc::control::SessionCommand
+                    >;
+} // namespace lumiera
diff --git a/src/proc/control/session-command-service.cpp b/src/proc/control/session-command-service.cpp
index 4f3915bae..b2d8141a7 100644
--- a/src/proc/control/session-command-service.cpp
+++ b/src/proc/control/session-command-service.cpp
@@ -188,7 +188,7 @@ namespace control {
     
     
     
-    using lumiera::facade::LUMIERA_ERROR_FACADE_LIFECYCLE;
+    using lumiera::error::LERR_(LIFECYCLE);
     
     lib::Depend<SessionCommandService> _instance; ///< a backdoor for the C Language impl to access the actual SessionCommand implementation...
     
@@ -203,7 +203,7 @@ namespace control {
                                                            const char*, (const char* cmdID, const char* invocationID),
                                                              {
                                                                if (!_instance) 
-                                                                 return lumiera_error_set(LUMIERA_ERROR_FACADE_LIFECYCLE, cmdID);
+                                                                 return lumiera_error_set (LUMIERA_ERROR_LIFECYCLE, cmdID);
                                                                else
                                                                  return _instance().cycle(cmdID, invocationID);
                                                              }
@@ -211,7 +211,7 @@ namespace control {
                                , LUMIERA_INTERFACE_INLINE (trigger,
                                                            void, (const char* cmdID, const void* args),
                                                              {
-                                                               if (!_instance) lumiera_error_set(LUMIERA_ERROR_FACADE_LIFECYCLE, cmdID);
+                                                               if (!_instance) lumiera_error_set (LUMIERA_ERROR_LIFECYCLE, cmdID);
                                                                else
                                                                  _instance().trigger(cmdID, *static_cast<Rec const *> (args));
                                                              }
@@ -219,7 +219,7 @@ namespace control {
                                , LUMIERA_INTERFACE_INLINE (bindArg,
                                                            void, (const char* cmdID, const void* args),
                                                              {
-                                                               if (!_instance) lumiera_error_set(LUMIERA_ERROR_FACADE_LIFECYCLE, cmdID);
+                                                               if (!_instance) lumiera_error_set (LUMIERA_ERROR_LIFECYCLE, cmdID);
                                                                else
                                                                  _instance().bindArg(cmdID, *static_cast<Rec const *> (args));
                                                              }
@@ -227,7 +227,7 @@ namespace control {
                                , LUMIERA_INTERFACE_INLINE (invoke,
                                                            void, (const char* cmdID),
                                                              {
-                                                               if (!_instance) lumiera_error_set(LUMIERA_ERROR_FACADE_LIFECYCLE, cmdID);
+                                                               if (!_instance) lumiera_error_set (LUMIERA_ERROR_LIFECYCLE, cmdID);
                                                                else
                                                                  _instance().invoke(cmdID);
                                                              }
diff --git a/src/proc/play/dummy-player-interface-proxy.cpp b/src/proc/play/dummy-player-interface-proxy.cpp
index af420ce22..0bb788bf8 100644
--- a/src/proc/play/dummy-player-interface-proxy.cpp
+++ b/src/proc/play/dummy-player-interface-proxy.cpp
@@ -41,9 +41,9 @@
  **          proxy used by the client code to access the interface).
  ** 
  ** @see dummy-player-facade.hpp
- ** @see dummy-player-service.hpp actual implementation within the Proc-Layer 
+ ** @see dummy-player-service.hpp actual implementation within the Proc-Layer
  ** @deprecated obsolete early design draft from 2009;
- **             as of 2018 only kept in source to compile some likewise obsolete UI widgets. 
+ **             as of 2018 only kept in source to compile some likewise obsolete UI widgets.
  */
 
 
@@ -52,7 +52,7 @@
 
 
     /* ==================== DummyPlayer ======================================= */
-    
+
 #include "include/dummy-player-facade.h"
 #include "include/interfaceproxy.hpp"
 
@@ -61,20 +61,22 @@ namespace lumiera {
   // emit the vtable here into this translation unit within liblumieracommon.so ...
   DummyPlayer::~DummyPlayer()  { }
   
+  /** static storage for the facade access front-end */
+  lib::Depend<DummyPlayer> DummyPlayer::facade;
   
   
   
   
   namespace facade {
     
-    typedef lumiera::InstanceHandle< LUMIERA_INTERFACE_INAME(lumieraorg_DummyPlayer, 0)
-                                   , lumiera::DummyPlayer
-                                   > IHandle_DummyPlayer;
+    using IHandle = InstanceHandle< LUMIERA_INTERFACE_INAME(lumieraorg_DummyPlayer, 0)
+                                  , lumiera::DummyPlayer
+                                  >;
     
     
     template<>
-    class Proxy<IHandle_DummyPlayer>
-      : public Binding<IHandle_DummyPlayer>
+    class Proxy<IHandle>
+      : public Binding<IHandle>
       {
         //----Proxy-Implementation-of-DummyPlayer--------
         typedef lumiera::DummyPlayer::Process Process;
@@ -106,13 +108,8 @@ namespace lumiera {
         using IBinding::IBinding;
       };
     
-    
-//    template  void openProxy<IHandle_DummyPlayer>  (IHandle_DummyPlayer const&);
-//    template  void closeProxy<IHandle_DummyPlayer> (void);
-    
-    
   } // namespace facade
-  
+
   
    /* === Forwarding function(s) on the Process handle === */
   
@@ -128,4 +125,9 @@ namespace lumiera {
   
   
   
+  
+template
+class InstanceHandle< LUMIERA_INTERFACE_INAME(lumieraorg_DummyPlayer, 0)
+                                             , lumiera::DummyPlayer
+                                             >;
 } // namespace lumiera
diff --git a/src/proc/play/dummy-player-service.cpp b/src/proc/play/dummy-player-service.cpp
index 346f53f62..3a4d5f036 100644
--- a/src/proc/play/dummy-player-service.cpp
+++ b/src/proc/play/dummy-player-service.cpp
@@ -176,7 +176,7 @@ namespace proc  {
       
       
       
-      using lumiera::facade::LUMIERA_ERROR_FACADE_LIFECYCLE;
+      using lumiera::error::LERR_(LIFECYCLE);
       lib::Depend<DummyPlayerService> _instance; ///< a backdoor for the C Language impl to access the actual SessionCommand implementation...
       
       typedef ProcessImpl* ProcP;
@@ -192,7 +192,7 @@ namespace proc  {
                                                                { 
                                                                  if (!_instance)
                                                                    { 
-                                                                     lumiera_error_set(LUMIERA_ERROR_FACADE_LIFECYCLE, 0);
+                                                                     lumiera_error_set (LUMIERA_ERROR_LIFECYCLE, 0);
                                                                      return 0;
                                                                    }
                                                                  
@@ -204,7 +204,7 @@ namespace proc  {
                                                                { 
                                                                  if (!_instance)
                                                                    { 
-                                                                     lumiera_error_set(LUMIERA_ERROR_FACADE_LIFECYCLE, 0);
+                                                                     lumiera_error_set(LUMIERA_ERROR_LIFECYCLE, 0);
                                                                      return;
                                                                    }
                                                                  
@@ -219,7 +219,7 @@ namespace proc  {
                                                                { 
                                                                  if (!_instance)
                                                                    { 
-                                                                     lumiera_error_set(LUMIERA_ERROR_FACADE_LIFECYCLE, 0);
+                                                                     lumiera_error_set(LUMIERA_ERROR_LIFECYCLE, 0);
                                                                      return;
                                                                    }
                                                                  
diff --git a/src/proc/play/output-director.hpp b/src/proc/play/output-director.hpp
index f1bf22c5a..60bfe39b1 100644
--- a/src/proc/play/output-director.hpp
+++ b/src/proc/play/output-director.hpp
@@ -46,6 +46,9 @@
 #include <memory>
 
 
+namespace lumiera {
+  class Play;
+}
 namespace proc {
 namespace play {
   
@@ -54,14 +57,9 @@ namespace play {
 //using std::shared_ptr;
   using std::unique_ptr;
   
-  
-  class Play;
   class PlayService;
   
   
-//typedef lib::ScopedPtrVect<DisplayerSlot> DisplayerTab;
-  
-  
   
   /**************************************************//**
    * Management of external Output connections.
@@ -73,7 +71,7 @@ namespace play {
     , public lib::Sync<>
     {
       using SigTerm = lumiera::Subsys::SigTerm;
-      using PlayServiceHandle = lib::DependInject<Play>::ServiceInstance<PlayService>;
+      using PlayServiceHandle = lib::DependInject<lumiera::Play>::ServiceInstance<PlayService>;
       
       PlayServiceHandle player_;
       ///////TODO more components and connections to manage here...
diff --git a/src/proc/play/play-service.cpp b/src/proc/play/play-service.cpp
index e1f9d5f46..4e40edd4a 100644
--- a/src/proc/play/play-service.cpp
+++ b/src/proc/play/play-service.cpp
@@ -47,6 +47,8 @@ namespace lumiera {
   
   Play::~Play() { } // emit VTables here...
   
+  /** static storage for the facade access front-end */
+  lib::Depend<Play> Play::facade;
   
 }//(End) namespace lumiera
 
diff --git a/src/proc/play/play-service.hpp b/src/proc/play/play-service.hpp
index e84043134..b666c499e 100644
--- a/src/proc/play/play-service.hpp
+++ b/src/proc/play/play-service.hpp
@@ -68,7 +68,6 @@ namespace proc {
 namespace play {
 
   using std::string;
-  using lumiera::facade::InterfaceFacadeLink;
 //using lumiera::Subsys;
 //using lumiera::Display;
 //using lumiera::DummyPlayer;
diff --git a/wiki/thinkPad.ichthyo.mm b/wiki/thinkPad.ichthyo.mm
index 9752744d8..133234dc1 100644
--- a/wiki/thinkPad.ichthyo.mm
+++ b/wiki/thinkPad.ichthyo.mm
@@ -28508,8 +28508,8 @@
 <icon BUILTIN="yes"/>
 <node CREATED="1522697230906" ID="ID_1495746023" MODIFIED="1522697253419" TEXT="alle Bindings sind vom Instance-Handle zu entkoppeln"/>
 <node CREATED="1522697255215" ID="ID_1841184306" MODIFIED="1522697273416" TEXT="f&#xfc;r jedes Binding soll eine TranslationUnit frei w&#xe4;hlbar sein"/>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1522697350106" ID="ID_138544872" MODIFIED="1522697365816" TEXT="Technik zur Entkoppelung ben&#xf6;tigt">
-<icon BUILTIN="flag-yellow"/>
+<node COLOR="#338800" CREATED="1522697350106" ID="ID_138544872" MODIFIED="1522724906505" TEXT="Technik zur Entkoppelung ben&#xf6;tigt">
+<icon BUILTIN="button_ok"/>
 </node>
 </node>
 </node>
@@ -28551,14 +28551,14 @@
 <node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1522697646161" ID="ID_1020206021" MODIFIED="1522697654713" TEXT="Technologie">
 <icon BUILTIN="pencil"/>
 <node CREATED="1522697675229" ID="ID_1605136526" MODIFIED="1522697732617" STYLE="fork" TEXT="Indirektion notwendig">
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1522697690651" ID="ID_1244533717" MODIFIED="1522697720935" TEXT="Erzeugung">
-<icon BUILTIN="flag-yellow"/>
+<node COLOR="#338800" CREATED="1522697690651" ID="ID_1244533717" MODIFIED="1522724892373" TEXT="Erzeugung">
+<icon BUILTIN="button_ok"/>
 </node>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1522697699297" ID="ID_891061833" MODIFIED="1522697720295" TEXT="Zerst&#xf6;rung">
-<icon BUILTIN="flag-yellow"/>
+<node COLOR="#338800" CREATED="1522697699297" ID="ID_891061833" MODIFIED="1522724893954" TEXT="Zerst&#xf6;rung">
+<icon BUILTIN="button_ok"/>
 </node>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1522697702521" ID="ID_1874387796" MODIFIED="1522697719559" TEXT="Zugriff auf Facade(Proxy)">
-<icon BUILTIN="flag-yellow"/>
+<node COLOR="#338800" CREATED="1522697702521" ID="ID_1874387796" MODIFIED="1522724895488" TEXT="Zugriff auf Facade(Proxy)">
+<icon BUILTIN="button_ok"/>
 </node>
 </node>
 <node CREATED="1522697743604" ID="ID_829814208" MODIFIED="1522697751286" TEXT="m&#xf6;gliche L&#xf6;sungen">
@@ -28657,6 +28657,18 @@
 </node>
 <node CREATED="1522709579398" ID="ID_1445259032" MODIFIED="1522709595885" TEXT="kann man spezialisieren und zugleich Instantiieren?">
 <icon BUILTIN="help"/>
+<node CREATED="1522720815569" ID="ID_1906873483" MODIFIED="1522720817589" TEXT="nein"/>
+<node CREATED="1522720818625" ID="ID_693558811" MODIFIED="1522720821985" TEXT="wie schade">
+<icon BUILTIN="smily_bad"/>
+</node>
+</node>
+</node>
+<node CREATED="1522724948516" ID="ID_1547993807" MODIFIED="1522724964722" TEXT="explizite Instantiierung notwendig">
+<icon BUILTIN="messagebox_warning"/>
+<node CREATED="1522724966777" ID="ID_650754221" MODIFIED="1522724973013" TEXT="h&#xe4;&#xdf;lich und umst&#xe4;ndlich"/>
+<node CREATED="1522724973625" ID="ID_1016558302" MODIFIED="1522724976780" TEXT="Code dupliziert"/>
+<node BACKGROUND_COLOR="#fdfdcf" COLOR="#ff0000" CREATED="1522724977440" ID="ID_686663661" MODIFIED="1522724991255" TEXT="bessere L&#xf6;sung?">
+<icon BUILTIN="flag-pink"/>
 </node>
 </node>
 </node>
@@ -28711,23 +28723,25 @@
 <font ITALIC="true" NAME="SansSerif" SIZE="12"/>
 <icon BUILTIN="ksmiletris"/>
 </node>
-<node CREATED="1522709629935" ID="ID_151551561" MODIFIED="1522709645169" TEXT="L&#xf6;sung zum Entkoppeln der Proxy-Definition"/>
+<node COLOR="#338800" CREATED="1522709629935" ID="ID_151551561" MODIFIED="1522724915985" TEXT="L&#xf6;sung zum Entkoppeln der Proxy-Definition">
+<icon BUILTIN="button_ok"/>
+</node>
 </node>
 <node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1522709654308" ID="ID_1059248114" MODIFIED="1522709793386" TEXT="bestehenden Code umschreiben">
 <icon BUILTIN="pencil"/>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1522709669498" ID="ID_9288802" MODIFIED="1522709700910" TEXT="alle bestehenden Proxies">
-<icon BUILTIN="flag-yellow"/>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1522635397309" ID="ID_590180071" MODIFIED="1522709705713" TEXT="SessionCommandService">
-<icon BUILTIN="flag-yellow"/>
+<node COLOR="#338800" CREATED="1522709669498" ID="ID_9288802" MODIFIED="1522724927071" TEXT="alle bestehenden Proxies">
+<icon BUILTIN="button_ok"/>
+<node COLOR="#338800" CREATED="1522635397309" ID="ID_590180071" MODIFIED="1522724921600" TEXT="SessionCommandService">
+<icon BUILTIN="button_ok"/>
 </node>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1522635417932" ID="ID_1711611771" MODIFIED="1522709706659" TEXT="DisplayService">
-<icon BUILTIN="flag-yellow"/>
+<node COLOR="#338800" CREATED="1522635417932" ID="ID_1711611771" MODIFIED="1522724922888" TEXT="DisplayService">
+<icon BUILTIN="button_ok"/>
 </node>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1522635433910" ID="ID_444280759" MODIFIED="1522709723772" TEXT="GuiNotification">
-<icon BUILTIN="flag-yellow"/>
+<node COLOR="#338800" CREATED="1522635433910" ID="ID_444280759" MODIFIED="1522724924183" TEXT="GuiNotification">
+<icon BUILTIN="button_ok"/>
 </node>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1522635450269" ID="ID_1963184158" MODIFIED="1522709725003" TEXT="DummyPlayerService">
-<icon BUILTIN="flag-yellow"/>
+<node COLOR="#338800" CREATED="1522635450269" ID="ID_1963184158" MODIFIED="1522724925717" TEXT="DummyPlayerService">
+<icon BUILTIN="button_ok"/>
 </node>
 </node>
 <node COLOR="#338800" CREATED="1522709729297" ID="ID_1293938610" MODIFIED="1522717901995" TEXT="Facade-Accessoren auf lib::Depend umstellen">