diff --git a/Control/AthenaKernel/AthenaKernel/IDataShare.h b/Control/AthenaKernel/AthenaKernel/IDataShare.h
index d3921bccf338be6f88b3ffd506134ad2bb9581f4..81c244bdd7d4357cbe882b82c4ac0d4647b1831b 100644
--- a/Control/AthenaKernel/AthenaKernel/IDataShare.h
+++ b/Control/AthenaKernel/AthenaKernel/IDataShare.h
@@ -49,7 +49,7 @@ public:
   /**
    * @brief Read the data
    */
-  virtual StatusCode readData() const = 0;
+  virtual StatusCode readData() = 0;
 };
 
 
diff --git a/Database/AthenaPOOL/AthenaPoolCnvSvc/AthenaPoolCnvSvc/IAthenaPoolCnvSvc.h b/Database/AthenaPOOL/AthenaPoolCnvSvc/AthenaPoolCnvSvc/IAthenaPoolCnvSvc.h
index 99284d0f00301af32b2db10adfdfe179fd9bdf50..3ba23ed770231a06eb50d27e006dcad354a1980a 100644
--- a/Database/AthenaPOOL/AthenaPoolCnvSvc/AthenaPoolCnvSvc/IAthenaPoolCnvSvc.h
+++ b/Database/AthenaPOOL/AthenaPoolCnvSvc/AthenaPoolCnvSvc/IAthenaPoolCnvSvc.h
@@ -54,7 +54,7 @@ public:
 
    /// @param obj [OUT] pointer to the Data Object.
    /// @param token [IN] string token of the Data Object for which a Pool Ref is filled.
-   virtual void setObjPtr(void*& obj, const Token* token) const = 0;
+   virtual void setObjPtr(void*& obj, const Token* token) = 0;
 
    /// @return a boolean for using detailed time and size statistics.
    virtual bool useDetailChronoStat() const = 0;
diff --git a/Database/AthenaPOOL/AthenaPoolCnvSvc/src/AthenaPoolCnvSvc.cxx b/Database/AthenaPOOL/AthenaPoolCnvSvc/src/AthenaPoolCnvSvc.cxx
index 6ee02a6d051705c79a097931c87ffe7437ac773c..51518beb0b8e2e606c9035ca0ac1d3604c3f71a9 100644
--- a/Database/AthenaPOOL/AthenaPoolCnvSvc/src/AthenaPoolCnvSvc.cxx
+++ b/Database/AthenaPOOL/AthenaPoolCnvSvc/src/AthenaPoolCnvSvc.cxx
@@ -846,11 +846,16 @@ Token* AthenaPoolCnvSvc::registerForWrite(Placement* placement, const void* obj,
    return(token);
 }
 //______________________________________________________________________________
-void AthenaPoolCnvSvc::setObjPtr(void*& obj, const Token* token) const {
+void AthenaPoolCnvSvc::setObjPtr(void*& obj, const Token* token) {
    ATH_MSG_VERBOSE("Requesting object for: " << token->toString());
    if (m_doChronoStat) {
       m_chronoStatSvc->chronoStart("cObjR_ALL");
    }
+   if (m_makeStreamingToolClient.value() > 0 && !m_inputStreamingTool.empty() && !m_inputStreamingTool->isServer() && !m_inputStreamingTool->isClient()) {
+      if (!makeClient(-m_makeStreamingToolClient.value()).isSuccess()) {
+         ATH_MSG_ERROR("Could not make AthenaPoolCnvSvc a Share Client");
+      }
+   }
    if (!m_outputStreamingTool.empty() && m_streamServer < m_outputStreamingTool.size()
 		   && m_outputStreamingTool[m_streamServer]->isServer()) {
       if (token->dbID() == Guid::null()) {
@@ -940,6 +945,12 @@ StatusCode AthenaPoolCnvSvc::createAddress(long svcType,
       ATH_MSG_ERROR("createAddress: svcType != POOL_StorageType " << svcType << " " << POOL_StorageType);
       return(StatusCode::FAILURE);
    }
+   if (m_makeStreamingToolClient.value() > 0 && !m_inputStreamingTool.empty() && !m_inputStreamingTool->isServer() && !m_inputStreamingTool->isClient()) {
+      if (!makeClient(-m_makeStreamingToolClient.value()).isSuccess()) {
+         ATH_MSG_ERROR("Could not make AthenaPoolCnvSvc a Share Client");
+         return(StatusCode::FAILURE);
+      }
+   }
    Token* token = nullptr;
    if (par[0].substr(0, 3) == "SHM") {
       token = new Token();
@@ -1103,7 +1114,7 @@ StatusCode AthenaPoolCnvSvc::makeClient(int num) {
    return(m_inputStreamingTool->makeClient(num));
 }
 //________________________________________________________________________________
-StatusCode AthenaPoolCnvSvc::readData() const {
+StatusCode AthenaPoolCnvSvc::readData() {
    if (m_inputStreamingTool.empty()) {
       return(StatusCode::FAILURE);
    }
diff --git a/Database/AthenaPOOL/AthenaPoolCnvSvc/src/AthenaPoolCnvSvc.h b/Database/AthenaPOOL/AthenaPoolCnvSvc/src/AthenaPoolCnvSvc.h
index 630766b5b972b8be53234925947df356cb49e18a..ff4e651dddae0b276b3e99f2431793193fa3d2b8 100644
--- a/Database/AthenaPOOL/AthenaPoolCnvSvc/src/AthenaPoolCnvSvc.h
+++ b/Database/AthenaPOOL/AthenaPoolCnvSvc/src/AthenaPoolCnvSvc.h
@@ -99,7 +99,7 @@ public:
 
    /// @param obj [OUT] pointer to the Data Object.
    /// @param token [IN] string token of the Data Object for which a Pool Ref is filled.
-   void setObjPtr(void*& obj, const Token* token) const;
+   void setObjPtr(void*& obj, const Token* token);
 
    /// @return a boolean for using detailed time and size statistics.
    bool useDetailChronoStat() const;
@@ -152,7 +152,7 @@ public:
    virtual StatusCode makeClient(int num);
 
    /// Read the next data object
-   virtual StatusCode readData() const;
+   virtual StatusCode readData();
 
    /// Send abort to SharedWriter clients if the server quits on error
    /// @param client_n [IN] number of the current client, -1 if no current
diff --git a/Database/AthenaPOOL/AthenaPoolCnvSvc/test/T_AthenaPoolAuxContainerCnv_test.cxx b/Database/AthenaPOOL/AthenaPoolCnvSvc/test/T_AthenaPoolAuxContainerCnv_test.cxx
index ff8d44c2bd68904ffebbf7cd6ab10c5a370e9789..c82597113a1b805e9072796011beda6025b8959a 100644
--- a/Database/AthenaPOOL/AthenaPoolCnvSvc/test/T_AthenaPoolAuxContainerCnv_test.cxx
+++ b/Database/AthenaPOOL/AthenaPoolCnvSvc/test/T_AthenaPoolAuxContainerCnv_test.cxx
@@ -49,7 +49,7 @@ public:
       m_pers2 (nullptr)
   {}
 
-  virtual void setObjPtr(void*& obj, const Token* /*token*/) const override
+  virtual void setObjPtr(void*& obj, const Token* /*token*/) override
   {
     if (m_pers2) {
       obj = new YAuxCont_v2 (*m_pers2);
diff --git a/Database/AthenaPOOL/AthenaPoolCnvSvc/test/T_AthenaPoolTPCnvCnv_test.cxx b/Database/AthenaPOOL/AthenaPoolCnvSvc/test/T_AthenaPoolTPCnvCnv_test.cxx
index ac964f1fb8fe4281a87b7b9ca9c476a23819b139..a75b13c22154cdf0f8bda9abeca35cef5fb22753 100644
--- a/Database/AthenaPOOL/AthenaPoolCnvSvc/test/T_AthenaPoolTPCnvCnv_test.cxx
+++ b/Database/AthenaPOOL/AthenaPoolCnvSvc/test/T_AthenaPoolTPCnvCnv_test.cxx
@@ -44,7 +44,7 @@ public:
       m_pers2 (nullptr)
   {}
 
-  virtual void setObjPtr(void*& obj, const Token* /*token*/) const override
+  virtual void setObjPtr(void*& obj, const Token* /*token*/) override
   {
     if (m_pers2) {
       obj = new XCont_p2 (*m_pers2);
diff --git a/Database/AthenaPOOL/AthenaPoolCnvSvc/test/T_AthenaPoolViewVectorCnv_test.cxx b/Database/AthenaPOOL/AthenaPoolCnvSvc/test/T_AthenaPoolViewVectorCnv_test.cxx
index 03d9e441712982d54c83594399a62cb27a11ed3b..ba57e7647d90f74693da766fff1838ab2adde096 100644
--- a/Database/AthenaPOOL/AthenaPoolCnvSvc/test/T_AthenaPoolViewVectorCnv_test.cxx
+++ b/Database/AthenaPOOL/AthenaPoolCnvSvc/test/T_AthenaPoolViewVectorCnv_test.cxx
@@ -100,7 +100,7 @@ public:
       m_pers_old (nullptr)
   {}
 
-  virtual void setObjPtr(void*& obj, const Token* token) const override
+  virtual void setObjPtr(void*& obj, const Token* token) override
   {
     if (m_pers) {
       auto vvb = new ViewVector<DataVector<Y_v2> > (*m_pers);
diff --git a/Database/AthenaPOOL/AthenaPoolCnvSvc/test/T_AthenaPoolxAODCnv_test.cxx b/Database/AthenaPOOL/AthenaPoolCnvSvc/test/T_AthenaPoolxAODCnv_test.cxx
index 8c85da607c8af48f46874f67383c92b98fd9929a..ad32a48ed6950af9d0c971245eba06c6c0db8f65 100644
--- a/Database/AthenaPOOL/AthenaPoolCnvSvc/test/T_AthenaPoolxAODCnv_test.cxx
+++ b/Database/AthenaPOOL/AthenaPoolCnvSvc/test/T_AthenaPoolxAODCnv_test.cxx
@@ -47,7 +47,7 @@ public:
       m_pers2 (nullptr)
   {}
 
-  virtual void setObjPtr(void*& obj, const Token* /*token*/) const override
+  virtual void setObjPtr(void*& obj, const Token* /*token*/) override
   {
     if (m_pers2) {
       DataVector<Y_v2>* v = new DataVector<Y_v2>;
diff --git a/Database/AthenaPOOL/AthenaPoolCnvSvc/test/TestCnvSvcBase.icc b/Database/AthenaPOOL/AthenaPoolCnvSvc/test/TestCnvSvcBase.icc
index 8b9cdf0739a9551160b434548e1eb496cca56e41..6a820b1c01c7ff6889f31bd4bd95e10667c21272 100644
--- a/Database/AthenaPOOL/AthenaPoolCnvSvc/test/TestCnvSvcBase.icc
+++ b/Database/AthenaPOOL/AthenaPoolCnvSvc/test/TestCnvSvcBase.icc
@@ -105,7 +105,7 @@ public:
   { std::abort(); }
   virtual StatusCode connectOutput(const std::string& /*outputFile*/) override
   { std::abort(); }
-  virtual StatusCode readData() const override
+  virtual StatusCode readData() override
   { std::abort(); }
   virtual const std::string& name() const override
   { return m_name; }
diff --git a/Database/AthenaPOOL/EventSelectorAthenaPool/src/EventSelectorAthenaPool.cxx b/Database/AthenaPOOL/EventSelectorAthenaPool/src/EventSelectorAthenaPool.cxx
index 03ea3fae542cdd26813e12df03dcc72a331d2e6d..1496c4d919f41c3ccc1cd826b16cd6d049f2b96b 100644
--- a/Database/AthenaPOOL/EventSelectorAthenaPool/src/EventSelectorAthenaPool.cxx
+++ b/Database/AthenaPOOL/EventSelectorAthenaPool/src/EventSelectorAthenaPool.cxx
@@ -166,6 +166,11 @@ StatusCode EventSelectorAthenaPool::initialize() {
    if (!m_eventStreamingTool.empty() && !m_eventStreamingTool.retrieve().isSuccess()) {
       ATH_MSG_FATAL("Cannot get " << m_eventStreamingTool.typeAndName() << "");
       return(StatusCode::FAILURE);
+   } else if (m_makeStreamingToolClient.value() == -1) {
+      if (!m_eventStreamingTool->makeClient(m_makeStreamingToolClient.value()).isSuccess()) {
+         ATH_MSG_ERROR("Could not make AthenaPoolCnvSvc a Share Client");
+         return(StatusCode::FAILURE);
+      }
    }
 
    // Ensure the xAODCnvSvc is listed in the EventPersistencySvc
@@ -478,6 +483,15 @@ StatusCode EventSelectorAthenaPool::createContext(IEvtSelector::Context*& ctxt)
 StatusCode EventSelectorAthenaPool::next(IEvtSelector::Context& ctxt) const {
    std::lock_guard<CallMutex> lockGuard(m_callLock);
    if (!m_eventStreamingTool.empty() && m_eventStreamingTool->isClient()) {
+      if (m_makeStreamingToolClient.value() == -1) {
+         StatusCode sc = m_eventStreamingTool->lockEvent(m_evtCount);
+         while (sc.isRecoverable()) {
+            usleep(1000);
+            sc = m_eventStreamingTool->lockEvent(m_evtCount);
+         }
+      }
+      // Increase event count
+      ++m_evtCount;
       void* tokenStr = nullptr;
       unsigned int status = 0;
       if (!m_eventStreamingTool->getLockedEvent(&tokenStr, status).isSuccess()) {
diff --git a/Database/AthenaPOOL/EventSelectorAthenaPool/src/EventSelectorAthenaPool.h b/Database/AthenaPOOL/EventSelectorAthenaPool/src/EventSelectorAthenaPool.h
index b04379fd2cc361c19bd189b209a66697df9352c7..6f340f063b12123fdbea363468c1c7054d81d0ca 100644
--- a/Database/AthenaPOOL/EventSelectorAthenaPool/src/EventSelectorAthenaPool.h
+++ b/Database/AthenaPOOL/EventSelectorAthenaPool/src/EventSelectorAthenaPool.h
@@ -209,6 +209,8 @@ private: // properties
    ToolHandleArray<IAthenaSelectorTool> m_helperTools{this};
    ToolHandle<IAthenaSelectorTool> m_counterTool{this, "CounterTool", "", ""};
    ToolHandle<IAthenaIPCTool> m_eventStreamingTool{this, "SharedMemoryTool", "", ""};
+   /// Make this instance a Streaming Client during first iteration automatically
+   IntegerProperty m_makeStreamingToolClient{this,"MakeStreamingToolClient",0};
 
    /// The following are included for compatibility with McEventSelector and are not really used.
    /// However runNo, oldRunNo and overrideRunNumberFromInput are used to reset run number for