diff --git a/src/proc/engine/buffer-provider.cpp b/src/proc/engine/buffer-provider.cpp
index c9a2311e8..0ca617577 100644
--- a/src/proc/engine/buffer-provider.cpp
+++ b/src/proc/engine/buffer-provider.cpp
@@ -63,6 +63,13 @@ namespace engine {
     return provider_->verifyValidity(*this);
   }
   
+  
+  void
+  BuffHandle::release()
+  {
+    UNIMPLEMENTED ("forward buffer release call to buffer provider");
+  }
+  
 
 
 } // namespace engine
diff --git a/src/proc/engine/buffhandle.hpp b/src/proc/engine/buffhandle.hpp
index 889638724..8401bdb17 100644
--- a/src/proc/engine/buffhandle.hpp
+++ b/src/proc/engine/buffhandle.hpp
@@ -132,9 +132,16 @@ namespace engine {
       // using standard copy operations
       
       
+      
+      void release();
+      
+      
       template<typename BU>
       BU& create();
       
+      template<typename BU>
+      BU& accessAs();
+      
       
       Buff&
       operator* ()  const
@@ -175,6 +182,18 @@ namespace engine {
   }
   
   
+  /** convenience shortcuts: access the buffer contents in a typesafe fashion.
+   *  This is equivalent to a plain dereferentiation with additional metadata check
+   * @throw error::Logic in case of type mismatch \c LUMIERA_ERROR_WRONG_TYPE
+   */
+  template<typename BU>
+  BU&
+  BuffHandle::accessAs()
+  {
+    UNIMPLEMENTED ("convenience shortcut to access buffer contents typesafe");
+  }
+  
+  
   
 } // namespace engine
 #endif
diff --git a/src/proc/engine/diagnostic-buffer-provider.hpp b/src/proc/engine/diagnostic-buffer-provider.hpp
index 42011673a..c8836b617 100644
--- a/src/proc/engine/diagnostic-buffer-provider.hpp
+++ b/src/proc/engine/diagnostic-buffer-provider.hpp
@@ -47,6 +47,23 @@ namespace engine {
   class DiagnosticBufferProvider
     : public BufferProvider
     {
+      
+      
+      /* === BufferProvider Implementation === */
+      
+      virtual BuffHandle
+      lockBufferFor (BufferDescriptor const& descriptor)
+        {
+          UNIMPLEMENTED ("lock buffer for exclusive use");
+        }
+      
+      virtual void
+      releaseBuffer (BuffHandle const& handle)
+        {
+          UNIMPLEMENTED ("release a buffer and invalidate the handle");
+        }
+      
+      
     public:
       /** build a new Diagnostic Buffer Provider instance,
        *  discard the existing one. Use the static query API
@@ -57,6 +74,60 @@ namespace engine {
           UNIMPLEMENTED ("Diagnostic Buffer Provider instance");
         }
       
+      
+      /** access the diagnostic API of the buffer provider
+       * @throw error::Invalid if the given provider doesn't allow
+       *        for diagnostic access or wasn't registered beforehand.
+       */
+      static DiagnosticBufferProvider&
+      access (BufferProvider const& provider)
+        {
+          UNIMPLEMENTED ("access existing instance linked to the given provider");
+        }
+      
+      
+      
+      
+      /* === diagnostic API === */
+      
+      bool
+      buffer_was_used (uint bufferID)
+        {
+          UNIMPLEMENTED ("check usage flag of a specific buffer");
+        }
+      
+      
+      bool
+      buffer_was_closed (uint bufferID)
+        {
+          UNIMPLEMENTED ("check closed-flag of a specific buffer");
+        }
+      
+      
+      template<typename BU>
+      bool
+      object_was_attached (uint bufferID)
+        {
+          UNIMPLEMENTED ("verify object attachment status of a specific buffer");
+        }
+      
+      
+      template<typename BU>
+      bool
+      object_was_destroyed (uint bufferID)
+        {
+          UNIMPLEMENTED ("verify object attachment status of a specific buffer");
+        }
+      
+      
+      void*
+      accessStorage (uint bufferID)
+        {
+          
+        }
+      
+      
+      
     private:
       
     };
diff --git a/tests/components/proc/engine/buffer-provider-protocol-test.cpp b/tests/components/proc/engine/buffer-provider-protocol-test.cpp
index 38f65568d..7846dec5a 100644
--- a/tests/components/proc/engine/buffer-provider-protocol-test.cpp
+++ b/tests/components/proc/engine/buffer-provider-protocol-test.cpp
@@ -88,22 +88,20 @@ namespace test  {
           CHECK (sizeof(TestFrame) <= buff.size());
           buff.create<TestFrame>() = testData(0);
           
-#if false /////////////////////////////////////////////////////////////////////////////////////////////////////////////UNIMPLEMENTED :: TICKET #829
-          TestFrame* storage = *buff;
-          CHECK (testData(0) == *storage);
+          TestFrame& storage = buff.accessAs<TestFrame>();
+          CHECK (testData(0) == storage);
           
           buff.release();
           CHECK (!buff.isValid());
-          VERIFY_ERROR (LIFECYCLE, *buff );
+          VERIFY_ERROR (LIFECYCLE, buff.accessAs<TestFrame>() );
           
-          DiagnosticBufferProvider checker = DiagnosticBufferProvider::access(provider);
+          DiagnosticBufferProvider& checker = DiagnosticBufferProvider::access(provider);
           CHECK (checker.buffer_was_used (0));
           CHECK (checker.buffer_was_closed (0));
-          CHECK (checker.object_was_attached<TestFrame> ());
-          CHECK (checker.object_was_destroyed<TestFrame> ());
+          CHECK (checker.object_was_attached<TestFrame> (0));
+          CHECK (checker.object_was_destroyed<TestFrame> (0));
           
           CHECK (testData(0) == checker.accessStorage (0));
-#endif    /////////////////////////////////////////////////////////////////////////////////////////////////////////////UNIMPLEMENTED :: TICKET #829
         }
       
       
diff --git a/tests/components/proc/engine/testframe.hpp b/tests/components/proc/engine/testframe.hpp
index 0ea6a8d75..5678bf147 100644
--- a/tests/components/proc/engine/testframe.hpp
+++ b/tests/components/proc/engine/testframe.hpp
@@ -55,6 +55,24 @@ namespace test   {
     {
       
     public:
+      
+      bool
+      operator== (void* memLocation)
+        {
+          UNIMPLEMENTED ("verify contents of an arbitrary memory location");
+        }
+      
+      friend bool
+      operator== (TestFrame const& f1, TestFrame const& f2)
+        {
+          UNIMPLEMENTED ("equality of test data frames");
+        }
+      
+      friend bool
+      operator!= (TestFrame const& f1, TestFrame const& f2)
+        {
+          return !(f1 == f2);
+        }
     };