diff --git a/pyPlc.py b/pyPlc.py
index 843bf50..fb640b2 100644
--- a/pyPlc.py
+++ b/pyPlc.py
@@ -32,7 +32,7 @@ def cbShowStatus(s, selection=""):
         lblMode['text']=s
         s=""
     if (selection == "pevmac"):
-        lblPevMac['text']=s
+        lblPevMac['text']="PEV MAC " + s
         s=""
     if (len(s)>0):
         lblStatus['text']=s
@@ -40,9 +40,8 @@ def cbShowStatus(s, selection=""):
 
 root = tk.Tk()
 lastKey = ''
-display = tk.Label(root, text='No Key', width=30) # A textual element in the graphical user interface
-display.pack()
-lblHelp = tk.Label(root, text="x=exit, t=testframe")
+lblHelp = tk.Label(root, justify= "left")
+lblHelp['text']="x=exit \nS=GET_SW \nP=PEV mode \nE=EVSE mode \nL=Listen mode \ns=SET_KEY \nG=GET_KEY (try twice) \nt=SET_KEY modified"
 lblHelp.pack()
 lblStatus = tk.Label(root, text="(Status)")
 lblStatus.pack()
@@ -52,7 +51,6 @@ lblMode = tk.Label(root, text="(mode)")
 lblMode.pack()
 
 # Bind the keyboard handler to all relevant elements:
-display.bind('<Key>', storekeyname)
 root.bind('<Key>', storekeyname)
 cbShowStatus("initialized")
 root.update()
diff --git a/pyPlcHomeplug.py b/pyPlcHomeplug.py
index 4d35d06..1da81a0 100644
--- a/pyPlcHomeplug.py
+++ b/pyPlcHomeplug.py
@@ -401,8 +401,7 @@ class pyPlcHomeplug():
         self.mytransmitbuffer[37]=0x43 # 
 
 
-    def sendTestFrame(self, selection):
-        
+    def sendTestFrame(self, selection): 
         if (selection=="1"):
             self.composeSlacParamReq()
             self.addToTrace("transmitting SLAC_PARAM.REQ...")
@@ -420,13 +419,9 @@ class pyPlcHomeplug():
             self.addToTrace("transmitting SET_KEY.REQ (key 0)")
             self.transmit(self.mytransmitbuffer)
         if (selection=="t"):
-            self.composeSetKey(2)
+            self.composeSetKey(2) # set key with modified content
             self.addToTrace("transmitting SET_KEY.REQ (key 2)")
             self.transmit(self.mytransmitbuffer)
-        if (selection=="D"):
-            self.composeDHCP()
-            self.addToTrace("transmitting broken DHCP")           
-            self.transmit(self.mytransmitbuffer)
         if (selection=="G"):
             self.composeGetKey()
             self.addToTrace("transmitting GET_KEY")           
@@ -600,10 +595,10 @@ class pyPlcHomeplug():
         for ts, pkt in self.sniffer: # attention: for using this in non-blocking manner, we need the patch described above.
             self.nPacketsReceived+=1
             # print('%d' % (ts)) # the time stamp
+            # We received an ethernet package. Determine its type, and dispatch it to the related handler.
             etherType = self.getEtherType(pkt)
             if (etherType == 0x88E1): # it is a HomePlug message
                 self.myreceivebuffer = pkt
-                #    self.showMacAddresses(pkt)
                 self.evaluateReceivedHomeplugPacket()
             if (etherType == 0x86dd): # it is an IPv6 frame
                 self.ipv6.evaluateReceivedPacket(pkt)
diff --git a/pyPlcWorker.py b/pyPlcWorker.py
index 6baab08..3b72b6d 100644
--- a/pyPlcWorker.py
+++ b/pyPlcWorker.py
@@ -33,8 +33,7 @@ class pyPlcWorker():
         if (strAction == "E"):
             self.hp.enterEvseMode()
         if (strAction == "L"):
-            self.hp.enterListenMode()
-            
-        self.addToTrace("UserAction " + strAction)
+            self.hp.enterListenMode()  
+        # self.addToTrace("UserAction " + strAction)
         self.hp.sendTestFrame(strAction)