diff --git a/rdpy/protocol/common/layer.py b/rdpy/protocol/common/layer.py
index a6a09ca..4085184 100644
--- a/rdpy/protocol/common/layer.py
+++ b/rdpy/protocol/common/layer.py
@@ -27,14 +27,14 @@ class Layer(object):
         if not self._presentation is None:
             self._presentation.connect()
     
-    def read(self, data):
+    def recv(self, data):
         '''
         signal that data is available for this layer
         call by transport layer
         default is to pass data to presentation layer
         '''
         if not self._presentation is None:
-            self._presentation.read(data)
+            self._presentation.recv(data)
       
     def write(self, data):
         '''
@@ -42,4 +42,5 @@ class Layer(object):
         write data for this layer
         default pass data to transport layer
         '''
-        self.transport.write(data)
\ No newline at end of file
+        if not self._transport is None:
+            self._transport.write(data)
\ No newline at end of file
diff --git a/rdpy/protocol/common/protocolbuffer.py b/rdpy/protocol/common/protocolbuffer.py
index 6d27946..129ee4b 100644
--- a/rdpy/protocol/common/protocolbuffer.py
+++ b/rdpy/protocol/common/protocolbuffer.py
@@ -35,20 +35,21 @@ class ProtocolBuffer(protocol.Protocol):
             #rest is for next event of automata
             self._buffer = self._buffer[self._expectedLen:]
             #call recv function
-            self.recv(expectedData)
+            self.recvExpectedData(expectedData)
             
     def expect(self, expectedLen, callback = None):
         '''
-        newt expected len
+        new expected len
         '''
         self._expectedLen = expectedLen
         
+        #default callback is recvExpectedData
         if callback is None:
-            callback = self.__class__.recv
+            callback = self.__class__.recvExpectedData
         
-        self.recv = callback
+        self.recvExpectedData = callback
         
-    def recv(self, data):
+    def recvExpectedData(self, data):
         '''
         call when expected data is receive
         '''
diff --git a/rdpy/protocol/rdp/tpkt.py b/rdpy/protocol/rdp/tpkt.py
index 7d72fb9..a7992cb 100644
--- a/rdpy/protocol/rdp/tpkt.py
+++ b/rdpy/protocol/rdp/tpkt.py
@@ -1,15 +1,15 @@
 '''
-Created on 5 sept. 2013
-
 @author: sylvain
 '''
-
 from rdpy.protocol.common.protocolbuffer import ProtocolBuffer
 from rdpy.protocol.common.layer import Layer
 from rdpy.protocol.common.stream import Stream
+
 class TPKT(ProtocolBuffer, Layer):
     '''
-    classdocs
+    TPKT layer in RDP protocol stack
+    this layer only handle size of packet
+    and determine if is a fast path packet
     '''
     def __init__(self, presentation = None):
         '''
@@ -25,39 +25,62 @@ class TPKT(ProtocolBuffer, Layer):
     def connectionMade(self):
         '''
         call when transport layer connection
-        is made
+        is made (inherit from ProtocolBuffer)
         '''
+        #header is on two bytes
         self.expect(2, self.readHeader)
+        #no connection automata on this layer
         self.connect()
         
     def readHeader(self, data):
+        '''
+        read header of TPKT packet
+        '''
         #first read packet version
         self._lastPacketVersion = data.read_uint8()
-        
+        #classic packet
         if self._lastPacketVersion == 3:
             data.read_uint8()
+            #read end header
             self.expect(2, self.readExtendedHeader)
         else:
+            #is fast path packet
             self._lastShortLength = data.read_uint8()
             if self._lastShortLength & 0x80:
+                #size is 1 byte more
                 self.expect(1, self.readExtendedFastPathHeader)
                 return
             self.expect(self._lastShortLength - 2, self.readFastPath)
                 
         
     def readExtendedHeader(self, data):
+        '''
+        header may be on 4 bytes
+        '''
+        #next state is read data
         self.expect(data.read_beuint16() - 4, self.readData)
     
     def readExtendedFastPathHeader(self, data):
+        '''
+        fast ath header may be on 1 byte more
+        '''
         self._lastShortLength &= ~0x80
         self._lastShortLength = (self._lastShortLength << 8) + data.read_uint8()
+        #next state is fast patn data
         self.expect(self._lastShortLength - 3, self.readFastPath)
     
     def readFastPath(self, data):
+        '''
+        fast path data
+        '''
         pass
     
     def readData(self, data):
-        self._protocol.dataReceived(data)
+        '''
+        read classic TPKT packet
+        '''
+        #next state is pass to 
+        self.recv(data)
         self.expect(2, self.readHeader)
         
     def write(self, data):
diff --git a/rdpy/vncclient.py b/rdpy/vncclient.py
index 4e8bc25..b1d9151 100644
--- a/rdpy/vncclient.py
+++ b/rdpy/vncclient.py
@@ -19,7 +19,7 @@ if __name__ == '__main__':
     protocol = rfb.Rfb(rfb.Rfb.CLIENT)
     w = widget.QRemoteDesktop(adaptor.RfbAdaptor(protocol))
     w.resize(1000, 700)
-    w.setWindowTitle('QVNCViewer')
+    w.setWindowTitle('vncclient')
     w.show()
     from twisted.internet import reactor
     reactor.connectTCP("127.0.0.1", 5901, factory.RfbFactory(protocol))