diff --git a/exampleB1.cc b/exampleB1.cc
index 099a778..e998256 100644
--- a/exampleB1.cc
+++ b/exampleB1.cc
@@ -39,6 +39,7 @@
 #include "G4UIExecutive.hh"
 
 #include "Randomize.hh"
+#include "UserHookForAbortState.hh"
 
 using namespace B1;
 
@@ -86,6 +87,9 @@ int main(int argc,char** argv)
   // Get the pointer to the User Interface manager
   G4UImanager* UImanager = G4UImanager::GetUIpointer();
 
+  // User's hook for state change
+  UserHookForAbortState* uhfas = new UserHookForAbortState();
+
   // Process macro or start UI session
   //
   if ( ! ui ) {
diff --git a/include/UserHookForAbortState.hh b/include/UserHookForAbortState.hh
new file mode 100644
index 0000000..816bfef
--- /dev/null
+++ b/include/UserHookForAbortState.hh
@@ -0,0 +1,16 @@
+#ifndef UserHookForAbortState_H
+#define UserHookForAbortState_H 1
+
+#include "G4VStateDependent.hh"
+
+class UserHookForAbortState : public G4VStateDependent
+{
+
+  public:
+
+    UserHookForAbortState(); // constructor
+    ~UserHookForAbortState(); // destructor
+    virtual G4bool Notify(G4ApplicationState requiredState);
+};
+
+#endif
diff --git a/run.mac b/run.mac
new file mode 100644
index 0000000..0bc7b4f
--- /dev/null
+++ b/run.mac
@@ -0,0 +1,22 @@
+# Macro file for example B1
+# 
+# Can be run in batch, without graphic
+# or interactively: Idle> /control/execute run1.mac
+#
+# Change the default number of workers (in multi-threading mode) 
+/run/numberOfThreads 1
+#
+# Initialize kernel
+/run/initialize
+#
+/control/verbose 0
+/run/verbose 0
+/event/verbose 0
+/tracking/verbose 0
+# 
+# gamma 6 MeV to the direction (0.,0.,1.)
+#
+/gun/particle gamma
+/gun/energy 6 MeV
+#
+/run/beamOn 5
diff --git a/src/EventAction.cc b/src/EventAction.cc
index a400550..25357ca 100644
--- a/src/EventAction.cc
+++ b/src/EventAction.cc
@@ -32,6 +32,7 @@
 
 #include "G4Event.hh"
 #include "G4RunManager.hh"
+#include "G4Run.hh"
 
 namespace B1
 {
@@ -52,6 +53,19 @@ EventAction::~EventAction()
 void EventAction::BeginOfEventAction(const G4Event*)
 {
   fEdep = 0.;
+  const G4Run* run = G4RunManager::GetRunManager()->GetCurrentRun();
+  G4cout << "@@@ GetNumberOfEvent=" << run->GetNumberOfEvent() << "\n" <<G4endl;
+  if (run->GetNumberOfEvent() == 3)
+  {
+    G4cout << "@@@ in if" << "\n" << G4endl;
+    G4ExceptionDescription ed;
+    ed << "force this exception! " << G4endl;
+    G4Exception("G4HadronicProcess::PostStepDoIt", "had006", FatalException,
+                ed);
+    //G4Exception("G4HadronicProcess::GetElementCrossSection", "had066",
+    //              JustWarning, ed);
+
+  };
 }
 
 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
diff --git a/src/UserHookForAbortState.cc b/src/UserHookForAbortState.cc
new file mode 100644
index 0000000..a14af24
--- /dev/null
+++ b/src/UserHookForAbortState.cc
@@ -0,0 +1,18 @@
+#include "G4ios.hh"
+#include "UserHookForAbortState.hh"
+
+UserHookForAbortState::UserHookForAbortState() {;}
+
+UserHookForAbortState::~UserHookForAbortState() {;}
+
+G4bool UserHookForAbortState::Notify(G4ApplicationState requiredState)
+{
+  G4cout << "$$$$$$$$$$$$$$$$$$ " << requiredState << G4endl;
+  //if(requiredState!=Abort) return true;
+  if(requiredState!=G4State_Abort) return true;
+  // Do book keeping here
+  G4cout << "!!!!!!!!!! " << "inside abort state handling" << "!!!!!!!!!!"  << G4endl;
+
+
+  return true;
+}