diff --git a/helper/ccnx-trace-helper.cc b/helper/ccnx-trace-helper.cc
index a27ba1a..8a53928 100644
--- a/helper/ccnx-trace-helper.cc
+++ b/helper/ccnx-trace-helper.cc
@@ -38,6 +38,7 @@
 #include "tracers/ccnx-aggregate-app-tracer.h"
 #include "tracers/ccnx-aggregate-l3-tracer.h"
 #include "tracers/ccnx-rate-l3-tracer.h"
+#include "tracers/ccnx-seqs-app-tracer.h"
 
 #include "ns3/ccnx-interest-header.h"
 #include "ns3/ccnx-content-object-header.h"
@@ -53,6 +54,7 @@
 
 CcnxTraceHelper::CcnxTraceHelper ()
   : m_l3RateTrace (0)
+  , m_appSeqsTrace (0)
 {
 }
 
@@ -60,6 +62,7 @@
 {
   NS_LOG_FUNCTION (this);
   if (m_l3RateTrace != 0) delete m_l3RateTrace;
+  if (m_appSeqsTrace != 0) delete m_appSeqsTrace;
   
   if (m_apps.size () > 0)
     {
@@ -199,4 +202,46 @@
     }
 }
 
+void
+CcnxTraceHelper::EnableSeqsAppAll (const std::string &appName, const std::string &trace)
+{
+  NS_LOG_FUNCTION (this);
+  m_appSeqsTrace = new ofstream (trace.c_str (), ios::trunc);
+
+  for (NodeList::Iterator node = NodeList::Begin ();
+       node != NodeList::End ();
+       node++)
+    {
+      ObjectVectorValue apps;
+      (*node)->GetAttribute ("ApplicationList", apps);
+
+      NS_LOG_DEBUG ("Node: " << lexical_cast<string> ((*node)->GetId ()));
+      
+      uint32_t appId = 0;
+      for (ObjectVectorValue::Iterator app = apps.Begin ();
+           app != apps.End ();
+           app++, appId++)
+        {
+          NS_LOG_DEBUG ("App: " << lexical_cast<string> (appId) << ", typeId: " << (*app)->GetInstanceTypeId ().GetName ());
+          if ((*app)->GetInstanceTypeId ().GetName () == appName)
+            {
+              Ptr<CcnxSeqsAppTracer> trace = Create<CcnxSeqsAppTracer> (boost::ref(*m_appSeqsTrace),
+                                                                        appName,
+                                                                        *node,
+                                                                        lexical_cast<string> (appId));
+              m_appSeqs.push_back (trace);
+            }
+        }
+      
+    }
+
+  if (m_appSeqs.size () > 0)
+    {
+      // *m_l3RateTrace << "# "; // not necessary for R's read.table
+      m_appSeqs.front ()->PrintHeader (*m_appSeqsTrace);
+      *m_appSeqsTrace << "\n";
+    }
+}
+
+
 } // namespace ns3
diff --git a/helper/ccnx-trace-helper.h b/helper/ccnx-trace-helper.h
index 54d7405..7a5eaf1 100644
--- a/helper/ccnx-trace-helper.h
+++ b/helper/ccnx-trace-helper.h
@@ -76,11 +76,17 @@
   EnableAggregateL3All ();
 
   /**
-   * @brief Enable network-level CCNx rate tracing on all CCNx nodes (individual file per node)
+   * @brief Enable network-level CCNx rate tracing on all CCNx nodes
    */
   void
   EnableRateL3All (const std::string &l3RateTrace = "l3-rate.log");
   
+  /**
+   * @brief Enable app-level CCNx sequence tracing on all CCNx applications
+   */
+  void
+  EnableSeqsAppAll (const std::string &app, const std::string &appSeqsTrace = "app-seqs.log");
+
 private:
   std::string m_appTrace;
   std::list<Ptr<CcnxAppTracer> > m_apps;
@@ -90,6 +96,9 @@
 
   std::list<Ptr<CcnxL3Tracer> > m_l3Rates;
   std::ostream *m_l3RateTrace;
+
+  std::list<Ptr<CcnxAppTracer> > m_appSeqs;
+  std::ostream *m_appSeqsTrace;
 };
 
 
diff --git a/helper/tracers/ccnx-seqs-app-tracer.cc b/helper/tracers/ccnx-seqs-app-tracer.cc
new file mode 100644
index 0000000..5ea636e
--- /dev/null
+++ b/helper/tracers/ccnx-seqs-app-tracer.cc
@@ -0,0 +1,116 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
+/*
+ * Copyright (c) 2011 UCLA
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation;
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * Author:  Alexander Afanasyev <alexander.afanasyev@ucla.edu>
+ */
+
+#include "ccnx-seqs-app-tracer.h"
+#include "ns3/node.h"
+#include "ns3/packet.h"
+#include "ns3/config.h"
+#include "ns3/callback.h"
+#include "ns3/simulator.h"
+
+#include "ns3/ccnx-app.h"
+#include "ns3/ccnx-face.h"
+#include "ns3/ccnx-interest-header.h"
+#include "ns3/ccnx-content-object-header.h"
+
+namespace ns3 {
+    
+CcnxSeqsAppTracer::CcnxSeqsAppTracer (std::ostream &os, const std::string &app, Ptr<Node> node, const std::string &appId)
+  : CcnxAppTracer (app, node, appId)
+  , m_os (os)
+{
+}
+
+CcnxSeqsAppTracer::CcnxSeqsAppTracer (std::ostream &os, const std::string &app, const std::string &node, const std::string &appId)
+  : CcnxAppTracer (app, node, appId)
+  , m_os (os)
+{
+}
+
+void
+CcnxSeqsAppTracer::Reset ()
+{
+}
+
+void
+CcnxSeqsAppTracer::PrintHeader (std::ostream &os) const
+{
+  os << "Time\t"
+     << "Node\t"
+     << "AppName\t"
+     << "AppId\t"
+     << "Type\t"
+     << "SeqNo";
+}
+
+void
+CcnxSeqsAppTracer::Print (std::ostream &os) const
+{
+}
+
+#define PRINTER(type)                                              \
+ m_os                                                              \
+ << Simulator::Now ().ToDouble (Time::S) << "\t"                   \
+ << m_node << "\t"                                                 \
+ << m_app << "\t"                                                  \
+ << m_appId << "\t"                                                \
+ << type << "\t"                                                   \
+ << header->GetName ().GetLastComponent () << std::endl;
+
+void
+CcnxSeqsAppTracer::OutInterests (std::string context,
+                                 Ptr<const CcnxInterestHeader> header, Ptr<CcnxApp>, Ptr<CcnxFace>)
+{
+  PRINTER ("OutInterest");
+}
+
+void
+CcnxSeqsAppTracer::OutData (std::string context,
+                            Ptr<const CcnxContentObjectHeader> header, Ptr<const Packet>,
+                            Ptr<CcnxApp>, Ptr<CcnxFace>)
+{
+  PRINTER ("OutData");
+}
+
+void
+CcnxSeqsAppTracer::InInterests (std::string context,
+                                Ptr<const CcnxInterestHeader> header,
+                                Ptr<CcnxApp>, Ptr<CcnxFace>)
+{
+  PRINTER ("InInterest");
+}
+
+void
+CcnxSeqsAppTracer::InNacks (std::string context,
+                            Ptr<const CcnxInterestHeader> header,
+                            Ptr<CcnxApp>, Ptr<CcnxFace>)
+{
+  PRINTER ("InNacks");
+}
+  
+void
+CcnxSeqsAppTracer::InData (std::string context,
+                           Ptr<const CcnxContentObjectHeader> header, Ptr<const Packet>,
+                           Ptr<CcnxApp>, Ptr<CcnxFace>)
+{
+  PRINTER ("InData");
+}
+
+} // namespace ns3
diff --git a/helper/tracers/ccnx-seqs-app-tracer.h b/helper/tracers/ccnx-seqs-app-tracer.h
new file mode 100644
index 0000000..b0fd618
--- /dev/null
+++ b/helper/tracers/ccnx-seqs-app-tracer.h
@@ -0,0 +1,71 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
+/*
+ * Copyright (c) 2011 UCLA
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation;
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * Author:  Alexander Afanasyev <alexander.afanasyev@ucla.edu>
+ */
+
+#ifndef CCNX_SEQS_APP_TRACER_H
+#define CCNX_SEQS_APP_TRACER_H
+
+#include "ns3/ccnx-app-tracer.h"
+
+namespace ns3 {
+
+class CcnxSeqsAppTracer : public CcnxAppTracer
+{
+public:
+  CcnxSeqsAppTracer (std::ostream &os, const std::string &app, Ptr<Node> node, const std::string &appId = "*");
+  CcnxSeqsAppTracer (std::ostream &os, const std::string &app, const std::string &node, const std::string &appId = "*");
+  virtual ~CcnxSeqsAppTracer () { };
+
+  virtual void
+  PrintHeader (std::ostream &os) const;
+
+  virtual void
+  Print (std::ostream &os) const;
+
+  virtual void
+  OutInterests (std::string context,
+                Ptr<const CcnxInterestHeader>, Ptr<CcnxApp>, Ptr<CcnxFace>);
+
+  virtual void
+  InInterests  (std::string context,
+                Ptr<const CcnxInterestHeader>, Ptr<CcnxApp>, Ptr<CcnxFace>);
+
+  virtual void
+  InNacks (std::string context,
+           Ptr<const CcnxInterestHeader>, Ptr<CcnxApp>, Ptr<CcnxFace>);
+
+  virtual void
+  OutData (std::string context,
+           Ptr<const CcnxContentObjectHeader>, Ptr<const Packet>, Ptr<CcnxApp>, Ptr<CcnxFace>);
+  
+  virtual void
+  InData  (std::string context,
+           Ptr<const CcnxContentObjectHeader>, Ptr<const Packet>, Ptr<CcnxApp>, Ptr<CcnxFace>);
+
+protected:
+  void
+  Reset ();
+
+protected:
+  std::ostream& m_os;
+};
+
+} // namespace ns3
+
+#endif // CCNX_AGGREGATE_APP_TRACER_H