diff --git a/DDEve/CMakeLists.txt b/DDEve/CMakeLists.txt
index d686047d363e341e71b4f3546bb42f0ba726d713..0d81534ca82c766c54e1a23427546f838dbce2d2 100644
--- a/DDEve/CMakeLists.txt
+++ b/DDEve/CMakeLists.txt
@@ -39,6 +39,9 @@ if(DD4HEP_USE_GEANT4)
     OPTIONAL  DDG4
     )
 endif()
+#-----------------------------------------------------------------------------------
+dd4hep_add_executable( ddeve      DDEve/DDEve.cpp )
+#-----------------------------------------------------------------------------------
 
 #---Package installation procedure(s) -------------------------------------
 dd4hep_install_dir ( DDEve DESTINATION examples )
diff --git a/DDEve/DDEve/DDEve.C b/DDEve/DDEve/DDEve.C
index d76fe9dd26ef1b7da7c669ebbfc590da45700156..08f2464d89d8f77a87fc102ac29460fe91cd2090 100644
--- a/DDEve/DDEve/DDEve.C
+++ b/DDEve/DDEve/DDEve.C
@@ -20,7 +20,7 @@
 #include "TSystem.h"
 #include "TInterpreter.h"
 
-void DDEve(const char* xmlConfig=0)  {
+void DDEve(const char* xmlConfig=0, const char* evtData=0)  {
   Long_t result;
   char text[1024];
   const char* dd4hep = gSystem->Getenv("DD4hepINSTALL");
@@ -74,8 +74,10 @@ void DDEve(const char* xmlConfig=0)  {
     gSystem->Exit(gSystem->GetErrno());
   }
 #endif
-  if ( xmlConfig )
-    ::snprintf(text,sizeof(text),"dd4hep::DDEve::run(\"%s\")",xmlConfig);
+  if ( xmlConfig && evtData )
+    ::snprintf(text,sizeof(text),"dd4hep::DDEve::run(\"%s\",\"%s\")", xmlConfig, evtData);
+  else if ( xmlConfig )
+    ::snprintf(text,sizeof(text),"dd4hep::DDEve::run(\"%s\")", xmlConfig);
   else 
     ::snprintf(text,sizeof(text),"dd4hep::DDEve::run(0)");
   gInterpreter->ProcessLine(text);
diff --git a/DDEve/DDEve/DDEve.cpp b/DDEve/DDEve/DDEve.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..13c5f1699cc8d7cdeb6fa951dc03081317ba3d00
--- /dev/null
+++ b/DDEve/DDEve/DDEve.cpp
@@ -0,0 +1,48 @@
+//==========================================================================
+//  AIDA Detector description implementation 
+//--------------------------------------------------------------------------
+// Copyright (C) Organisation europeenne pour la Recherche nucleaire (CERN)
+// All rights reserved.
+//
+// For the licensing terms see $DD4hepINSTALL/LICENSE.
+// For the list of contributors see $DD4hepINSTALL/doc/CREDITS.
+//
+// Author     : M.Frank
+//
+//==========================================================================
+
+// C/C++ include files
+#include <string>
+#include <iostream>
+
+// ROOT include files
+#include "TRint.h"
+#include "DDEve.C"
+
+int main(int argc, char** argv)    {
+  std::string config, data;
+  for(int i=1; i<argc; ++i)  {
+    if ( 0 == ::strncmp(argv[i],"-config",4) )
+      config = argv[++i];
+    else if ( 0 == ::strncmp(argv[i],"--config",5) )
+      config = argv[++i];
+    else if ( 0 == ::strncmp(argv[i],"-data",4) )
+      data = argv[++i];
+    else if ( 0 == ::strncmp(argv[i],"--data",5) )
+      data = argv[++i];
+    else  {
+      std::cout <<
+        "ddeve -opt [-opt] \n"
+        "   -config <file>    XML configuration file   \n"
+        "   -data   <file>    Event data file   file   \n"
+           << std::endl;
+      exit(0);
+    }
+  }
+  std::pair<int, char**> a(0,0);
+  const char* config_xml = config.empty() ? 0 : config.c_str();
+  gApplication = new TRint("DDEve", &a.first, a.second);
+  DDEve(config_xml);
+  gApplication->Run();
+  return 0;
+}
diff --git a/DDEve/include/DDEve/Dictionary.h b/DDEve/include/DDEve/Dictionary.h
index 4ddeaa49d1d1d4213a11f2c9d0ad84ff998e3106..65086e374d51c34d9c4d566103969cba64f5d359 100644
--- a/DDEve/include/DDEve/Dictionary.h
+++ b/DDEve/include/DDEve/Dictionary.h
@@ -53,8 +53,8 @@ namespace dd4hep {
    */
   struct DDEve {
     /// ROOT interactive entry point for running DDEve
-    static void run(const char* xmlFile)  {
-      EveDisplay(xmlFile, nullptr);
+    static void run(const char* xmlFile, const char* evtData=0)  {
+      EveDisplay(xmlFile, evtData);
     }
   };
 }
diff --git a/DDG4/include/DDG4/Geant4DetectorConstruction.h b/DDG4/include/DDG4/Geant4DetectorConstruction.h
index 1df4ec316cda933d02179ed07f16cdf87f63c61d..ab6eaef05bdb72cd1a295c5534363c1b8211ec6c 100644
--- a/DDG4/include/DDG4/Geant4DetectorConstruction.h
+++ b/DDG4/include/DDG4/Geant4DetectorConstruction.h
@@ -143,6 +143,8 @@ namespace dd4hep {
       virtual void updateContext(Geant4Context* ctxt);
       /// Add an actor responding to all callbacks. Sequence takes ownership.
       void adopt(Geant4DetectorConstruction* action);
+      /// Access an actor by name
+      Geant4DetectorConstruction* get(const std::string& nam)  const;
       /// Geometry construction callback. Called at "Construct()"
       virtual void constructGeo(Geant4DetectorConstructionContext* ctxt);
       /// Electromagnetic field construction callback. Called at "ConstructSDandField()"
diff --git a/DDG4/plugins/Geant4DetectorGeometryConstruction.cpp b/DDG4/plugins/Geant4DetectorGeometryConstruction.cpp
index e67ad7114a9f24cc0b98e4eed5bad89b927fe48a..cf122dc68790587bb1c3fb3055b67e66e8ff9d1d 100644
--- a/DDG4/plugins/Geant4DetectorGeometryConstruction.cpp
+++ b/DDG4/plugins/Geant4DetectorGeometryConstruction.cpp
@@ -128,7 +128,7 @@ void Geant4DetectorGeometryConstruction::constructGeo(Geant4DetectorConstruction
   conv.debugRegions    = m_debugRegions;
 
   ctxt->geometry       = conv.create(world).detach();
-  ctxt->geometry->printLevel = PrintLevel(m_geoInfoPrintLevel);
+  ctxt->geometry->printLevel = outputLevel();
   g4map.attach(ctxt->geometry);
   G4VPhysicalVolume* w = ctxt->geometry->world();
   // Create Geant4 volume manager only if not yet available
diff --git a/DDG4/python/DDG4.py b/DDG4/python/DDG4.py
index 0b46d18eadfb9e23397d7359c1f90533523de59b..0c850fe3692dec1fd7df8fc6b1ce7e43b7dca0d3 100644
--- a/DDG4/python/DDG4.py
+++ b/DDG4/python/DDG4.py
@@ -402,6 +402,10 @@ class Geant4:
     init_seq.adopt(init_action)
     return init_seq,init_action
 
+  def detectorConstruction(self):
+    seq = self.master().detectorConstruction(True)
+    return seq
+  
   """
      Configure Geant4 user initialization for optionasl multi-threading mode
 
diff --git a/DDG4/src/Geant4ActionContainer.cpp b/DDG4/src/Geant4ActionContainer.cpp
index 94b2a51da9397e3552534538cf6386468cde6ab0..d6b23c73c672f0bd92129a45905695505428348b 100644
--- a/DDG4/src/Geant4ActionContainer.cpp
+++ b/DDG4/src/Geant4ActionContainer.cpp
@@ -131,7 +131,7 @@ Geant4StackingActionSequence* Geant4ActionContainer::stackingAction(bool create)
 /// Access detector construcion action sequence (geometry+sensitives+field)
 Geant4DetectorConstructionSequence* Geant4ActionContainer::detectorConstruction(bool create)  {
   if (!m_constructionAction && create)
-    registerSequence(m_constructionAction, "StackingAction");
+    registerSequence(m_constructionAction, "DetectorConstructionAction");
   return m_constructionAction;
 }
 
diff --git a/DDG4/src/Geant4DetectorConstruction.cpp b/DDG4/src/Geant4DetectorConstruction.cpp
index 286e477f3bf26e0678a25269c23dd47cd2f99158..1a74a2a268613abd4f2cb44a52634aa72f43c70b 100644
--- a/DDG4/src/Geant4DetectorConstruction.cpp
+++ b/DDG4/src/Geant4DetectorConstruction.cpp
@@ -81,7 +81,18 @@ void Geant4DetectorConstructionSequence::adopt(Geant4DetectorConstruction* actio
     m_actors.add(action);
     return;
   }
-  throw runtime_error("Geant4RunActionSequence: Attempt to add invalid actor!");
+  except("Geant4RunActionSequence","++ Attempt to add an invalid actor!");
+}
+
+/// Access an actor by name
+Geant4DetectorConstruction* Geant4DetectorConstructionSequence::get(const std::string& nam)  const   {
+  for(auto* i : m_actors)  {
+    if ( i->name() == nam )  {
+      return i;
+    }
+  }
+  except("Geant4RunActionSequence","++ Attempt to access invalid actor %s!",nam.c_str());
+  return 0;
 }
 
 /// Geometry construction callback. Called at "Construct()"
diff --git a/DDG4/src/Geant4VolumeManager.cpp b/DDG4/src/Geant4VolumeManager.cpp
index b5d7f67410a4f8390a77ca2678445c6a9aaeb396..c7d395d183e1c16d5b18129b397fa9d0116b4bff 100644
--- a/DDG4/src/Geant4VolumeManager.cpp
+++ b/DDG4/src/Geant4VolumeManager.cpp
@@ -168,7 +168,7 @@ namespace {
                  int(control.size()),detail::tools::placementPath(control,true).c_str());
         goto Err;
       }
-      printout(ERROR, "Geant4VolumeManager", "populate: Severe error: Duplicated Volume entry: %X"
+      printout(ERROR, "Geant4VolumeManager", "populate: Severe error: Duplicated Volume entry: 0x%X"
                " [THIS SHOULD NEVER HAPPEN]", code);
 
     Err:
diff --git a/examples/ClientTests/compact/Assemblies.xml b/examples/ClientTests/compact/Assemblies.xml
index f8e27000f01ccd8d3122a10ef40c639110ec757e..ac3d30718b3bc045326205f8a37635538381d9e4 100644
--- a/examples/ClientTests/compact/Assemblies.xml
+++ b/examples/ClientTests/compact/Assemblies.xml
@@ -1,6 +1,17 @@
 <lccdd xmlns:compact="http://www.lcsim.org/schemas/compact/1.0" 
        xmlns:xs="http://www.w3.org/2001/XMLSchema" 
        xs:noNamespaceSchemaLocation="http://www.lcsim.org/schemas/compact/1.0/compact.xsd">
+<!-- #==========================================================================
+     #  AIDA Detector description implementation 
+     #--------------------------------------------------------------------------
+     # Copyright (C) Organisation europeenne pour la Recherche nucleaire (CERN)
+     # All rights reserved.
+     #
+     # For the licensing terms see $DD4hepINSTALL/LICENSE.
+     # For the list of contributors see $DD4hepINSTALL/doc/CREDITS.
+     #
+     #==========================================================================
+-->
 
   <info name="Assemblies_v01"
         title="Assembly Detector Toy model"
diff --git a/examples/ClientTests/compact/Bitfield_SidesTest.xml b/examples/ClientTests/compact/Bitfield_SidesTest.xml
index 9d8986875c349bce10ae73442b918ba78a3b1679..43ab5550df49eca42c48d92a5d45a13e162a7175 100644
--- a/examples/ClientTests/compact/Bitfield_SidesTest.xml
+++ b/examples/ClientTests/compact/Bitfield_SidesTest.xml
@@ -3,6 +3,18 @@
        xmlns:xs="http://www.w3.org/2001/XMLSchema" 
        xs:noNamespaceSchemaLocation="http://www.lcsim.org/schemas/compact/1.0/compact.xsd">
 
+<!-- #==========================================================================
+     #  AIDA Detector description implementation 
+     #--------------------------------------------------------------------------
+     # Copyright (C) Organisation europeenne pour la Recherche nucleaire (CERN)
+     # All rights reserved.
+     #
+     # For the licensing terms see $DD4hepINSTALL/LICENSE.
+     # For the list of contributors see $DD4hepINSTALL/doc/CREDITS.
+     #
+     #==========================================================================
+-->
+
   <includes>
     <gdmlFile  ref="${DD4hepINSTALL}/DDDetectors/compact/elements.xml"/>
     <gdmlFile  ref="${DD4hepINSTALL}/DDDetectors/compact/materials.xml"/>
diff --git a/examples/ClientTests/compact/Bitfield_SidesTest2.xml b/examples/ClientTests/compact/Bitfield_SidesTest2.xml
index f22f4a75830f4d36d9672a158ee78372ec91ad30..0c797623171370902d3af1e167fc9bcb5242cbbc 100644
--- a/examples/ClientTests/compact/Bitfield_SidesTest2.xml
+++ b/examples/ClientTests/compact/Bitfield_SidesTest2.xml
@@ -3,6 +3,18 @@
        xmlns:xs="http://www.w3.org/2001/XMLSchema" 
        xs:noNamespaceSchemaLocation="http://www.lcsim.org/schemas/compact/1.0/compact.xsd">
 
+<!-- #==========================================================================
+     #  AIDA Detector description implementation 
+     #--------------------------------------------------------------------------
+     # Copyright (C) Organisation europeenne pour la Recherche nucleaire (CERN)
+     # All rights reserved.
+     #
+     # For the licensing terms see $DD4hepINSTALL/LICENSE.
+     # For the list of contributors see $DD4hepINSTALL/doc/CREDITS.
+     #
+     #==========================================================================
+-->
+
   <includes>
     <gdmlFile  ref="${DD4hepINSTALL}/DDDetectors/compact/elements.xml"/>
     <gdmlFile  ref="${DD4hepINSTALL}/DDDetectors/compact/materials.xml"/>
diff --git a/examples/ClientTests/compact/BoxTrafos.xml b/examples/ClientTests/compact/BoxTrafos.xml
index c09dd0499f82fe8d28a97eeff7449328d686d59d..edbd8c01ae9a371b53e289a774909e84940b7023 100644
--- a/examples/ClientTests/compact/BoxTrafos.xml
+++ b/examples/ClientTests/compact/BoxTrafos.xml
@@ -2,6 +2,18 @@
        xmlns:xs="http://www.w3.org/2001/XMLSchema" 
        xs:noNamespaceSchemaLocation="http://www.lcsim.org/schemas/compact/1.0/compact.xsd">
   
+<!-- #==========================================================================
+     #  AIDA Detector description implementation 
+     #--------------------------------------------------------------------------
+     # Copyright (C) Organisation europeenne pour la Recherche nucleaire (CERN)
+     # All rights reserved.
+     #
+     # For the licensing terms see $DD4hepINSTALL/LICENSE.
+     # For the list of contributors see $DD4hepINSTALL/doc/CREDITS.
+     #
+     #==========================================================================
+-->
+
   <info name="alignment_boxes"
 	title="Alignment test with 2 simple boxes"
 	author="Markus Frank"
diff --git a/examples/ClientTests/compact/Check_Handles.xml b/examples/ClientTests/compact/Check_Handles.xml
index 2468d394a0317913051d936271e33d5a60dcb0a2..cc697cf9fe39639279e8d69f3ea31cae7011458c 100644
--- a/examples/ClientTests/compact/Check_Handles.xml
+++ b/examples/ClientTests/compact/Check_Handles.xml
@@ -3,6 +3,18 @@
        xmlns:xs="http://www.w3.org/2001/XMLSchema" 
        xs:noNamespaceSchemaLocation="http://www.lcsim.org/schemas/compact/1.0/compact.xsd">
 
+<!-- #==========================================================================
+     #  AIDA Detector description implementation 
+     #--------------------------------------------------------------------------
+     # Copyright (C) Organisation europeenne pour la Recherche nucleaire (CERN)
+     # All rights reserved.
+     #
+     # For the licensing terms see $DD4hepINSTALL/LICENSE.
+     # For the list of contributors see $DD4hepINSTALL/doc/CREDITS.
+     #
+     #==========================================================================
+-->
+
   <includes>
     <gdmlFile  ref="${DD4hepINSTALL}/DDDetectors/compact/elements.xml"/>
     <gdmlFile  ref="${DD4hepINSTALL}/DDDetectors/compact/materials.xml"/>
diff --git a/examples/DDCodex/compact/CODEX-b-alone.xml b/examples/DDCodex/compact/CODEX-b-alone.xml
index 6edf57471bddbab2a032ff44f9c7dc888d867d1b..0f5351c102539b4fae1964238e7d1c16f0ea3b6f 100644
--- a/examples/DDCodex/compact/CODEX-b-alone.xml
+++ b/examples/DDCodex/compact/CODEX-b-alone.xml
@@ -2,6 +2,18 @@
        xmlns:xs="http://www.w3.org/2001/XMLSchema" 
        xs:noNamespaceSchemaLocation="http://www.lcsim.org/schemas/compact/1.0/compact.xsd">
 
+<!-- #==========================================================================
+     #  AIDA Detector description implementation 
+     #--------------------------------------------------------------------------
+     # Copyright (C) Organisation europeenne pour la Recherche nucleaire (CERN)
+     # All rights reserved.
+     #
+     # For the licensing terms see $DD4hepINSTALL/LICENSE.
+     # For the list of contributors see $DD4hepINSTALL/doc/CREDITS.
+     #
+     #==========================================================================
+-->
+
   <!-- Have the materials    -->
   <includes>
     <gdmlFile  ref="${DD4hepINSTALL}/DDDetectors/compact/elements.xml"/>
diff --git a/examples/DDCodex/compact/CODEX-b.xml b/examples/DDCodex/compact/CODEX-b.xml
index af7261f7249b02f3d5801acfd7ed727e89d4b64d..753673d854f58dff410a8a38c868e00ef30e1d49 100644
--- a/examples/DDCodex/compact/CODEX-b.xml
+++ b/examples/DDCodex/compact/CODEX-b.xml
@@ -1,6 +1,19 @@
 <lccdd xmlns:compact="http://www.lcsim.org/schemas/compact/1.0" 
        xmlns:xs="http://www.w3.org/2001/XMLSchema" 
        xs:noNamespaceSchemaLocation="http://www.lcsim.org/schemas/compact/1.0/compact.xsd">
+
+<!-- #==========================================================================
+     #  AIDA Detector description implementation 
+     #--------------------------------------------------------------------------
+     # Copyright (C) Organisation europeenne pour la Recherche nucleaire (CERN)
+     # All rights reserved.
+     #
+     # For the licensing terms see $DD4hepINSTALL/LICENSE.
+     # For the list of contributors see $DD4hepINSTALL/doc/CREDITS.
+     #
+     #==========================================================================
+-->
+
 <!--
   <includes>
     <gdmlFile  ref="elements.xml"/>
diff --git a/examples/DDCodex/eve/DDEve.xml b/examples/DDCodex/eve/DDEve.xml
index 7b3776419722b667f4daf78570b5f954dc8da0e5..8b4ce68887e6493521587c45dfff35af08af886d 100644
--- a/examples/DDCodex/eve/DDEve.xml
+++ b/examples/DDCodex/eve/DDEve.xml
@@ -1,4 +1,15 @@
 <ddeve>
+<!-- #==========================================================================
+     #  AIDA Detector description implementation 
+     #--------------------------------------------------------------------------
+     # Copyright (C) Organisation europeenne pour la Recherche nucleaire (CERN)
+     # All rights reserved.
+     #
+     # For the licensing terms see $DD4hepINSTALL/LICENSE.
+     # For the list of contributors see $DD4hepINSTALL/doc/CREDITS.
+     #
+     #==========================================================================
+-->
   <display visLevel="12" loadLevel="12"/>
 
   <collection name="CodexHits"         hits="PointSet" color="kRed" size="0.8"   type="20"/>