diff --git a/Python/filegenerator.py b/Python/filegenerator.py
index 2f9bb3a..b616996 100644
--- a/Python/filegenerator.py
+++ b/Python/filegenerator.py
@@ -12,11 +12,14 @@ def __init__(self, make_log, make_summary,
                  MaxQueueSize, DDDMappingDelay, PropDelay,
                  NumbDDDPortsOpen, bandwidths, timeUntilNextDDDChange,
                  overlapTime, numbSynAckResends, attackerType,
-                 isAmplification):
+                 isAmplification,sessionId):
         # boolean statements for deciding which files to make
         self.makeLog = make_log
         self.makeSummary = make_summary
         self.makeAnimation = make_animation
+        # File Name to be used
+        self.logFileName = "log-{0}.csv".format(str(sessionId))
+        self.summaryFileName = "summary-{0}.csv".format(str(sessionId))
         # names of the output files
         self.logName = log_name
         self.summaryName = summary_name
@@ -194,7 +197,7 @@ def addSummaryDataToLog(self, client, attacker,
                 self.lengthLongestEntry = len(self.packetDictionary["S: " + ' Step'])
 
     def initializeSummary(self):  # initializer for the summary file
-        self.summaryFile = open("summary.csv", "w")
+        self.summaryFile = open(self.summaryFileName, "w")
         self.headerGen(self.summaryFile)
 
     def initializeAnimationInstructions(self):
@@ -358,7 +361,7 @@ def outputFile(self):
                 while (len(self.packetDictionary.get(key)) < self.lengthLongestEntry):
                     self.packetDictionary.get(key).append("")
             sortedKeys = sorted(self.packetDictionary.keys(), key=self.sortHelper)
-            outputLogFile = open("log.csv", "w", newline='')
+            outputLogFile = open(self.logFileName, "w", newline='')
             self.headerGen(outputLogFile, "%L")
             generator = csv.writer(outputLogFile)
             generator.writerow(sortedKeys)
diff --git a/Python/main.py b/Python/main.py
index b61e862..0bf1ebe 100644
--- a/Python/main.py
+++ b/Python/main.py
@@ -1,3 +1,4 @@
+import uuid
 from . import packet
 from . import connectionObject
 from . import attacker
@@ -22,6 +23,9 @@ def runSimulation(dddState, skipsim, sumOut,
                   routertoNormal, normaltoRouter,
                   reflectortoRouter, attackertoReflector,
                   queueLimit, attackerType, amplification):
+	# For a simulation session, we create a unique session id for it using GUID.
+    sessionGuid = uuid.uuid4()		# Generate a GUID/UUID for this session
+
     print(amplification)
     print(attackerType)
 
@@ -34,7 +38,8 @@ def runSimulation(dddState, skipsim, sumOut,
                                           MaxQueueSize, DDDMappingDelay, PropDelay,
                                           NumbDDDPortsOpen, bandwidths,
                                           timeUntilNextDDDChange, overlapTime,
-                                          numbSynAckResends, attackerType, amplification)
+                                          numbSynAckResends, attackerType, 
+                                          amplification, sessionGuid)
 
     debug_mode = False
 
@@ -281,4 +286,6 @@ def runSimulation(dddState, skipsim, sumOut,
     fileGen.outputFile()
 
     # Return value will be the animateInstructions
-    return fileGen.instructions if hasattr(fileGen, 'instructions') else []
+    response = fileGen.instructions if hasattr(fileGen, 'instructions') else []
+    response.append(str(sessionGuid))
+    return response
diff --git a/cleanup.bat b/cleanup.bat
new file mode 100644
index 0000000..7dc45eb
--- /dev/null
+++ b/cleanup.bat
@@ -0,0 +1,2 @@
+@echo off
+del *.csv
\ No newline at end of file
diff --git a/static/js/requests.js b/static/js/requests.js
index 40d310b..32f3ed7 100644
--- a/static/js/requests.js
+++ b/static/js/requests.js
@@ -33,6 +33,9 @@ var queueLimit;
 var attackerType;
 var amplification;
 
+// When simulation started, we will retrieve a session ID.
+var sessionId
+
 function startSimulation(){
     DDDstate = document.getElementById("DDDstate").checked;
     skipsim = document.getElementById("simOption").checked;
@@ -80,6 +83,8 @@ function sendGet(){
     xmlHttp.onreadystatechange = function() {
         if (xmlHttp.readyState == 4 && xmlHttp.status == 200){
             let jsonObj = JSON.parse(xmlHttp.responseText);
+			sessionId = jsonObj[jsonObj.length - 1];
+			console.log('Session GUID = ' + sessionId)
             console.log('length of animateInstructions list is ' + jsonObj.length);
             setAnimateInstructions(jsonObj);
         }
@@ -123,26 +128,27 @@ function downloadFile(){
   var request1;
   var request2;
 
-console.log(summfile);
-console.log(logfile);
+  console.log(summfile);
+  console.log(logfile);
+  
   if(summfile){
     if(filename1){
-        request1 = baseUrl + "download2/" + 'summary.csv' + "&" +filename1;
+        request1 = baseUrl + "download2/" + 'summary-' + sessionId + '.csv' + "&" +filename1;
         window.open(request1, '_blank');
     }
     else{
-      request1 = baseUrl + "download/" + 'summary.csv';
+      request1 = baseUrl + "download/" + 'summary-' + sessionId + '.csv';
       window.open(request1, '_blank');
     }
   }
 
   if(logfile){
     if(filename2){
-      request2 = baseUrl + "download2/" + 'log.csv' + "&" +filename2;
+      request2 = baseUrl + "download2/" + 'log-' + sessionId + '.csv' + "&" +filename2;
       window.open(request2, '_blank');
     }
     else{
-      request2 = baseUrl + "download/" + 'log.csv';
+      request2 = baseUrl + "download/" + 'log-' + sessionId + '.csv';
       window.open(request2, '_blank');
     }
   }