diff --git a/src/common/guifacade.cpp b/src/common/guifacade.cpp
index 2797da693..a3081e953 100644
--- a/src/common/guifacade.cpp
+++ b/src/common/guifacade.cpp
@@ -22,7 +22,7 @@
 
 
 #include "gui/guifacade.hpp"
-#include "include/guinotificationfacade.h"
+#include "include/guinotification-facade.h"
 #include "lib/sync.hpp"
 #include "lib/error.hpp"
 #include "lib/singleton.hpp"
diff --git a/src/common/interfaceproxy.cpp b/src/common/interfaceproxy.cpp
index 8386aa343..ea838e701 100644
--- a/src/common/interfaceproxy.cpp
+++ b/src/common/interfaceproxy.cpp
@@ -102,7 +102,7 @@ namespace lumiera {
   
     /* ==================== GuiNotification =================================== */
     
-#include "include/guinotificationfacade.h"
+#include "include/guinotification-facade.h"
 
 namespace gui {
   
diff --git a/src/gui/notification-service.hpp b/src/gui/notification-service.hpp
index 63ef677a4..c6e862be8 100644
--- a/src/gui/notification-service.hpp
+++ b/src/gui/notification-service.hpp
@@ -39,7 +39,7 @@
 #define GUI_NOTIFICATION_SERVICE_H
 
 
-#include "include/guinotificationfacade.h"
+#include "include/guinotification-facade.h"
 #include "common/instancehandle.hpp"
 #include "lib/singleton-ref.hpp"
 
diff --git a/src/include/display-facade.h b/src/include/display-facade.h
index d46afe2ca..7375ffce2 100644
--- a/src/include/display-facade.h
+++ b/src/include/display-facade.h
@@ -20,6 +20,19 @@
  
 */
 
+/** @file display-facade.hpp
+ ** Major public Interface of the Lumiera GUI. While generally speaking, the GUI
+ ** controls the application and thus acts on its own, it exposes some services
+ ** to the lower layers. Especially the lumiera::Display interface serves to
+ ** hand over calculated frames to the GUI for displaying them in a viewer.
+ ** It's a first draft as of 1/2009, probably it can be factored out into
+ ** a more general display service in future.
+ **
+ ** @see gui::GuiFacade
+ ** @see dummy-player-facade.h
+ ** 
+ */
+
 
 #ifndef GUI_INTERFACE_DISPLAY_H
 #define GUI_INTERFACE_DISPLAY_H
@@ -115,7 +128,9 @@ extern "C" {
 #include "common/interface.h"
 
 LUMIERA_INTERFACE_DECLARE (lumieraorg_Display, 0
-                          , LUMIERA_INTERFACE_SLOT (void,               put,(LumieraDisplaySlot, LumieraDisplayFrame, bool))
+                          , LUMIERA_INTERFACE_SLOT (void, allocate,(LumieraDisplaySlot)                     )
+                          , LUMIERA_INTERFACE_SLOT (void,  release,(LumieraDisplaySlot)                     )
+                          , LUMIERA_INTERFACE_SLOT (void,      put,(LumieraDisplaySlot, LumieraDisplayFrame))
 );
 
 
diff --git a/src/include/guinotificationfacade.h b/src/include/guinotification-facade.h
similarity index 96%
rename from src/include/guinotificationfacade.h
rename to src/include/guinotification-facade.h
index f3e334bff..dd07ad68c 100644
--- a/src/include/guinotificationfacade.h
+++ b/src/include/guinotification-facade.h
@@ -20,8 +20,8 @@
  
 */
 
-/** @file guinotificationfacade.hpp
- ** Main public Interface of the Lumiera GUI. While generally speaking, the GUI
+/** @file guinotification-facade.hpp
+ ** Major public Interface of the Lumiera GUI. While generally speaking, the GUI
  ** controls the application and thus acts on its own, it exposes some services
  ** usable by scripts or the two lower layers. The main purpose of these services
  ** is to push informations and status updates into the GUI.
diff --git a/src/include/interfaceproxy.hpp b/src/include/interfaceproxy.hpp
index 32248d762..26d1761f1 100644
--- a/src/include/interfaceproxy.hpp
+++ b/src/include/interfaceproxy.hpp
@@ -69,7 +69,7 @@
  ** @see plugin.h
  ** @see lumiera::Subsys
  ** @see guinotification.h usage example (facade interface)
- ** @see guinotificationfacade.cpp corresponding implementation within the GUI
+ ** @see guinotification-facade.cpp corresponding implementation within the GUI
  */