diff --git a/src/gui/ctrl/bus-controller.cpp b/src/gui/ctrl/bus-controller.cpp
index 5610ac628..8adf0764f 100644
--- a/src/gui/ctrl/bus-controller.cpp
+++ b/src/gui/ctrl/bus-controller.cpp
@@ -156,6 +156,21 @@ namespace ctrl {
   }
   
   
+  /** broadcast a notification message to all currently connected bus terminals.
+   * @param mark the actual state update or notification message to be delivered
+   * @return number of notified terminals.
+   * @remarks this call assumes that "somewhere" within the UI-Bus
+   *          a distribution node or hub is installed, with the ability
+   *          to find all currently connected terminals. In the standard
+   *          configuration this is implemented by the ctrl::Nexus
+   */
+  size_t
+  BusTerm::markAll (GenNode const& mark)
+  {
+    return theBus_.markAll (mark);
+  }
+  
+  
   /**
    * @internal establish new down-link connection form UI-Bus
    * @param node reference to the [Tangible] to be connected.
diff --git a/src/gui/ctrl/bus-term.hpp b/src/gui/ctrl/bus-term.hpp
index c7d59b055..c696f5a7a 100644
--- a/src/gui/ctrl/bus-term.hpp
+++ b/src/gui/ctrl/bus-term.hpp
@@ -110,6 +110,8 @@ namespace ctrl{
       virtual void note (ID subject, GenNode const& mark);
       virtual bool mark (ID subject, GenNode const& mark);
       
+      virtual size_t markAll (GenNode const& mark);
+      
       virtual operator string()  const;
       
       void note (GenNode const& mark);
diff --git a/src/gui/ctrl/nexus.hpp b/src/gui/ctrl/nexus.hpp
index 42b880e65..0956a86f0 100644
--- a/src/gui/ctrl/nexus.hpp
+++ b/src/gui/ctrl/nexus.hpp
@@ -103,6 +103,17 @@ namespace ctrl{
             }
         }
       
+      /** broadcast a notification to all connected terminal nodes.
+       * @note just uses the contents of the current routing table in arbitrary order.
+       */
+      virtual size_t
+      markAll (GenNode const& mark)  override
+        {
+          for (auto& entry : routingTable_)
+            this->mark (entry.first, mark);
+          return routingTable_.size();
+        }
+      
       /** add a new down-link connection to the routing table
        * @param identity the [endpoint-ID](\ref BusTerm::endpointID_) used
        *         to address the new element to be connected to the bus.
diff --git a/tests/gui/bus-term-test.cpp b/tests/gui/bus-term-test.cpp
index 6409cfe10..95f897158 100644
--- a/tests/gui/bus-term-test.cpp
+++ b/tests/gui/bus-term-test.cpp
@@ -308,10 +308,6 @@ namespace test {
           CHECK (mockA.isExpanded());
           CHECK (not mockC.isExpanded());
           CHECK (not mockC.isTouched());
-          
-          cout << "____Nexus-Log_________________\n"
-               << util::join(gui::test::Nexus::getLog(), "\n")
-               << "\n───╼━━━━━━━━━╾────────────────"<<endl;
         }
       
       
@@ -391,16 +387,32 @@ namespace test {
           
           CHECK (nexusLog.verifyEvent("mark", "Echo").id("Error")
                          .beforeCall("markAll").on("TestNexus").arg("Foxtrot")
-                         .beforeEvent("broadcast", "Foxtrot")
+                         .beforeEvent("Broadcast", "Foxtrot")
                          .beforeCall("mark").on("TestNexus").arg("bravo", "GenNode-ID(\"Message\")-DataCap|«string»|Foxtrot")
                          .beforeCall("doMsg").on("bravo").arg("Foxtrot")
                          .beforeEvent("TestNexus", "broadcasted mark to 3 terminals"));
           
-          ////////////////////////////////////////////////////////////////////////////////////////////////////TODO WIP
+          // the order of dispatch is unspecified,
+          // but we know a regular mark call sequence happens for each connected terminal
+          CHECK (nexusLog.verifyCall("markAll").on("TestNexus").arg("Foxtrot")
+                         .beforeCall("mark").on("TestNexus").arg("alpha", "Foxtrot")
+                         .beforeCall("doMsg").on("alpha").arg("Foxtrot")
+                         .beforeEvent("TestNexus", "successfully broadcasted"));
+          
+          CHECK (nexusLog.verifyCall("markAll").on("TestNexus").arg("Foxtrot")
+                         .beforeCall("mark").on("TestNexus").arg("bravo", "Foxtrot")
+                         .beforeCall("doMsg").on("bravo").arg("Foxtrot")
+                         .beforeEvent("TestNexus", "successfully broadcasted"));
+          
+          CHECK (nexusLog.verifyCall("markAll").on("TestNexus").arg("Foxtrot")
+                         .beforeCall("mark").on("TestNexus").arg("charly", "Foxtrot")
+                         .beforeCall("doMsg").on("charly").arg("Foxtrot")
+                         .beforeEvent("TestNexus", "successfully broadcasted"));
+          
+          
           cout << "____Nexus-Log_________________\n"
                << util::join(nexusLog, "\n")
                << "\n───╼━━━━━━━━━╾────────────────"<<endl;
-          ////////////////////////////////////////////////////////////////////////////////////////////////////TODO WIP
         }
       
       
@@ -408,6 +420,12 @@ namespace test {
       clearStates()
         {
           UNIMPLEMENTED ("broadcast state reset");
+          EventLog nexusLog = gui::test::Nexus::startNewLog();
+          ////////////////////////////////////////////////////////////////////////////////////////////////////TODO WIP
+          cout << "____Nexus-Log_________________\n"
+               << util::join(nexusLog, "\n")
+               << "\n───╼━━━━━━━━━╾────────────────"<<endl;
+          ////////////////////////////////////////////////////////////////////////////////////////////////////TODO WIP
           gui::test::Nexus::setStateMarkHandler(); // deinstall custom command handler
         }
       
diff --git a/tests/gui/test/test-nexus.cpp b/tests/gui/test/test-nexus.cpp
index f29d43d70..80f8d7b08 100644
--- a/tests/gui/test/test-nexus.cpp
+++ b/tests/gui/test/test-nexus.cpp
@@ -201,6 +201,16 @@ namespace test{
               }
           }
         
+        virtual size_t
+        markAll (GenNode const& mark)  override
+          {
+            log_.call(this, "markAll", mark);
+            log_.event("Broadcast", _Fmt("Broadcast mark(\"%s\"): %s") % mark.idi.getSym() % mark.data);
+            size_t cnt = BusHub::markAll (mark);
+            log_.event("TestNexus", _Fmt("successfully broadcasted mark to %d terminals") % cnt);
+            return cnt;
+          }
+        
         virtual BusTerm&
         routeAdd (ID identity, Tangible& newNode)  override
           {
@@ -326,6 +336,15 @@ namespace test{
             return false;
           }
         
+        virtual size_t
+        markAll (GenNode const& mark)  override
+          {
+            log().call(this, "markAll", mark);
+            log().error ("request to broadcast to all Zombies");
+            cerr << "broadcast message -> ZombieNexus" <<endl;
+            return 0;
+          }
+        
         virtual BusTerm&
         routeAdd (ID identity, Tangible& newNode)  override
           {