diff --git a/ClientApp/Utils/Client.cs b/ClientApp/Utils/Client.cs
index 3f0cd33..69f9f1b 100644
--- a/ClientApp/Utils/Client.cs
+++ b/ClientApp/Utils/Client.cs
@@ -139,12 +139,12 @@ namespace ClientApp.Utils
                             Console.WriteLine("Session started!");
                             this.sessionRunning = true;
                             if (engineConnection.Connected && !engineConnection.FollowingRoute) engineConnection.StartRouteFollow();
-                            sendMessage(DataParser.getStartSessionJson());
+                            Debug.WriteLine("start");
                             break;
                         case DataParser.STOP_SESSION:
                             Console.WriteLine("Stop session identifier");
                             this.sessionRunning = false;
-                            sendMessage(DataParser.getStopSessionJson());
+                            Debug.WriteLine("stop");
                             break;
                         case DataParser.SET_RESISTANCE:
                             Console.WriteLine("Set resistance identifier");
@@ -181,7 +181,7 @@ namespace ClientApp.Utils
         /// starts sending a message to the server
         /// </summary>
         /// <param name="message">the message to send</param>
-        private void sendMessage(byte[] message)
+        public void sendMessage(byte[] message)
         {
             stream.BeginWrite(message, 0, message.Length, new AsyncCallback(OnWrite), null);
         }
@@ -297,6 +297,7 @@ namespace ClientApp.Utils
         public void Dispose()
         {
             Debug.WriteLine("client dispose called");
+            sendMessage(DataParser.getDisconnectJson(LoginViewModel.Username));
             this.stream.Dispose();
             this.client.Dispose();
             this.handler.stop();
diff --git a/DoctorApp/Utils/Client.cs b/DoctorApp/Utils/Client.cs
index 26a87fb..a55151d 100644
--- a/DoctorApp/Utils/Client.cs
+++ b/DoctorApp/Utils/Client.cs
@@ -10,7 +10,7 @@ using Util;
 namespace DoctorApp.Utils
 {
     public delegate void EngineCallback();
-    public class Client : IDataReceiver
+    public class Client
     {
         private TcpClient client;
         private NetworkStream stream;
@@ -18,8 +18,6 @@ namespace DoctorApp.Utils
         private bool connected;
         private byte[] totalBuffer = new byte[1024];
         private int totalBufferReceived = 0;
-        private bool sessionRunning = false;
-        private IHandler handler = null;
         private LoginViewModel LoginViewModel;
         private MainViewModel MainViewModel;
         private ClientInfoViewModel ClientInfoViewModel;
@@ -83,6 +81,8 @@ namespace DoctorApp.Utils
 
                 string identifier;
                 bool isJson = DataParser.getJsonIdentifier(messageBytes, out identifier);
+
+                Debug.WriteLine("doctor " + Encoding.ASCII.GetString(payloadbytes));
                 if (isJson)
                 {
                     switch (identifier)
@@ -104,32 +104,19 @@ namespace DoctorApp.Utils
                             break;
                         case DataParser.START_SESSION:
                             Console.WriteLine("Session started!");
-                            this.sessionRunning = true;
-                            sendMessage(DataParser.getStartSessionJson());
                             break;
                         case DataParser.STOP_SESSION:
                             Console.WriteLine("Stop session identifier");
-                            this.sessionRunning = false;
-                            sendMessage(DataParser.getStopSessionJson());
                             break;
                         case DataParser.SET_RESISTANCE:
                             Console.WriteLine("Set resistance identifier");
-                            if (this.handler == null)
-                            {
-                                Console.WriteLine("handler is null");
-                                sendMessage(DataParser.getSetResistanceResponseJson(false));
-                            }
-                            else
-                            {
-                                this.handler.setResistance(DataParser.getResistanceFromJson(payloadbytes));
-                                sendMessage(DataParser.getSetResistanceResponseJson(true));
-                            }
                             break;
                         case DataParser.NEW_CONNECTION:
+                            Debug.WriteLine("doctor client new connection");
                             this.MainViewModel.NewConnectedUser(DataParser.getUsernameFromResponseJson(payloadbytes));
                             break;
                         case DataParser.DISCONNECT:
-                            this.MainViewModel.NewConnectedUser(DataParser.getUsernameFromResponseJson(payloadbytes));
+                            this.MainViewModel.DisconnectedUser(DataParser.getUsernameFromResponseJson(payloadbytes));
                             break;
                         default:
                             Console.WriteLine($"Received json with identifier {identifier}:\n{Encoding.ASCII.GetString(payloadbytes)}");
@@ -153,7 +140,7 @@ namespace DoctorApp.Utils
         /// starts sending a message to the server
         /// </summary>
         /// <param name="message">the message to send</param>
-        private void sendMessage(byte[] message)
+        public void sendMessage(byte[] message)
         {
             stream.BeginWrite(message, 0, message.Length, new AsyncCallback(OnWrite), null);
         }
@@ -167,63 +154,6 @@ namespace DoctorApp.Utils
             this.stream.EndWrite(ar);
         }
 
-        #region interface
-        //maybe move this to other place
-        /// <summary>
-        /// bpm method for receiving the BPM value from the bluetooth bike or the simulation
-        /// </summary>
-        /// <param name="bytes">the message</param>
-        public void BPM(byte[] bytes)
-        {
-            if (!sessionRunning)
-            {
-                return;
-            }
-            if (bytes == null)
-            {
-                throw new ArgumentNullException("no bytes");
-            }
-            byte[] message = DataParser.GetRawDataMessage(bytes);
-
-
-            this.stream.BeginWrite(message, 0, message.Length, new AsyncCallback(OnWrite), null);
-        }
-
-        /// <summary>
-        /// method for receiving the bike message from the bluetooth bike or the simulation
-        /// </summary>
-        /// <param name="bytes">the message</param>
-        public void Bike(byte[] bytes)
-        {
-
-            if (!sessionRunning)
-            {
-                return;
-            }
-            if (bytes == null)
-            {
-                throw new ArgumentNullException("no bytes");
-            }
-            byte[] message = DataParser.GetRawDataMessage(bytes);
-
-            /* switch (bytes[0])
-             {
-
-                 case 0x10:
-
-                     if (canSendToEngine) engineConnection.BikeSpeed = (bytes[4] | (bytes[5] << 8)) * 0.01f;
-                     break;
-                 case 0x19:
-                     if (canSendToEngine) engineConnection.BikePower = (bytes[5]) | (bytes[6] & 0b00001111) << 8;
-                     break;
-             }*/
-
-
-            this.stream.BeginWrite(message, 0, message.Length, new AsyncCallback(OnWrite), null);
-        }
-
-        #endregion
-
         /// <summary>
         /// wether or not the client stream is connected
         /// </summary>
@@ -246,15 +176,6 @@ namespace DoctorApp.Utils
             this.stream.BeginWrite(message, 0, message.Length, new AsyncCallback(OnWrite), null);
         }
 
-        /// <summary>
-        /// sets the handler for the client, so either the bike simulator or the bluetooth bike handler
-        /// </summary>
-        /// <param name="handler"></param>
-        public void SetHandler(IHandler handler)
-        {
-            this.handler = handler;
-        }
-
         internal void SetLoginViewModel(LoginViewModel loginViewModel)
         {
             this.LoginViewModel = loginViewModel;
@@ -275,7 +196,6 @@ namespace DoctorApp.Utils
             Debug.WriteLine("client dispose called");
             this.stream.Dispose();
             this.client.Dispose();
-            this.handler?.stop();
         }
     }
 }
diff --git a/DoctorApp/ViewModels/ClientInfoViewModel.cs b/DoctorApp/ViewModels/ClientInfoViewModel.cs
index 54d2df0..c40f6ea 100644
--- a/DoctorApp/ViewModels/ClientInfoViewModel.cs
+++ b/DoctorApp/ViewModels/ClientInfoViewModel.cs
@@ -1,13 +1,81 @@
-using System;
+using DoctorApp.Utils;
+using GalaSoft.MvvmLight.Command;
+using System;
 using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.ComponentModel;
 using System.Text;
+using System.Windows.Controls;
+using System.Windows.Input;
+using Util;
 
 namespace DoctorApp.ViewModels
 {
     
-    class ClientInfoViewModel
+    class ClientInfoViewModel : ObservableObject
     {
+        public ObservableCollection<string> ChatLog { get; set; }
         public string Username { get; set; }
-        public string TabName { get; set; }
+
+        public string Status { get; set; }
+
+        public int Speed { get; set; }
+
+        public int BPM { get; set; }
+
+        public int Resistance { get; set; }
+        public int Acc_Power { get; set; }
+
+        public int Curr_Power { get; set; }
+
+        public int Distance { get; set; }
+
+        public ICommand StartSession { get; set; }
+
+        public ICommand StopSession { get; set; }
+
+        public ICommand Chat { get; set; }
+
+        public ICommand ChatToAll { get; set; }
+
+        public ICommand ClientInfo { get; set; }
+
+        public ICommand SetResistance { get; set; }
+
+        public MainWindowViewModel MainWindowViewModel { get; set; }
+        private Client client;
+
+        public ClientInfoViewModel(MainWindowViewModel mainWindowViewModel)
+        {
+            MainWindowViewModel = mainWindowViewModel;
+            ChatLog = new ObservableCollection<string>();
+            client = mainWindowViewModel.client;
+
+            StartSession = new RelayCommand(()=>{
+                client.sendMessage(DataParser.getStartSessionJson(Username));
+                Status = "Session started";
+            });
+
+            StopSession = new RelayCommand(() => {
+                client.sendMessage(DataParser.getStopSessionJson(Username));
+                Status = "Session stopped, waiting to start again.";
+            });
+
+            Chat = new RelayCommand<object>((parameter) =>
+            {
+                client.sendMessage(DataParser.getChatJson(Username, ((TextBox)parameter).Text));
+                ChatLog.Add(DateTime.Now+": "+ ((TextBox)parameter).Text);
+            });
+
+            //TODO RelayCommand ChatToAll
+
+            SetResistance = new RelayCommand<object>((parameter) =>
+            {
+                client.sendMessage(DataParser.getSetResistanceJson(Username, float.Parse(((TextBox)parameter).Text)));
+            });
+
+        }
+
+
     }
 }
diff --git a/DoctorApp/ViewModels/MainViewModel.cs b/DoctorApp/ViewModels/MainViewModel.cs
index 2b34b32..90d4509 100644
--- a/DoctorApp/ViewModels/MainViewModel.cs
+++ b/DoctorApp/ViewModels/MainViewModel.cs
@@ -11,7 +11,7 @@ namespace DoctorApp.ViewModels
 {
     class MainViewModel : ObservableObject
     {
-        public ObservableCollection<object> Tabs { get; set; }
+        public ObservableCollection<ClientInfoViewModel> Tabs { get; set; }
         public int Selected { get; set; }
         public MainWindowViewModel MainWindowViewModel { get; set; }
 
@@ -21,26 +21,37 @@ namespace DoctorApp.ViewModels
         {
             this.MainWindowViewModel = mainWindowViewModel;
             client = this.MainWindowViewModel.client;
-            Tabs= new ObservableCollection<object>();
+            Tabs= new ObservableCollection<ClientInfoViewModel>();
         }
 
         public void NewConnectedUser(string username)
         {
+            System.Diagnostics.Debug.WriteLine("CREATING TAB FOR " + username);
             App.Current.Dispatcher.Invoke((Action)delegate
             {
-                Tabs.Add(new ClientInfoViewModel
+                Tabs.Add(new ClientInfoViewModel(MainWindowViewModel)
                 {
                     Username = username,
-                    TabName = username
+                    Status = "Waiting to start"
                 });
             });
         }
 
         public void DisconnectedUser(string username)
         {
-
+            App.Current.Dispatcher.Invoke((Action)delegate
+            {
+                foreach (ClientInfoViewModel item in Tabs)
+                {
+                    if (item.Username == username)
+                    {
+                        Tabs.Remove(item);
+                        break;
+                    }
+                }
+            });
         }
     }
 
-    
+
 }
diff --git a/DoctorApp/Views/ClientInfoView.xaml b/DoctorApp/Views/ClientInfoView.xaml
index 29eda51..33a0c12 100644
--- a/DoctorApp/Views/ClientInfoView.xaml
+++ b/DoctorApp/Views/ClientInfoView.xaml
@@ -24,8 +24,8 @@
                     <Setter Property="Margin" Value="0,0,20,0"/>
                 </Style>
             </StackPanel.Resources>
-            <Label Content="UserName" Name="Username_Label"/>
-            <Label Content="Status: " Name="Status_Label"/>
+            <Label Content="{Binding Path=Username}"/>
+            <Label Content="{Binding Path=Status}"/>
         </StackPanel>
         <StackPanel Margin="0,10,0,0" Grid.RowSpan="2" Grid.Row="1">
             <StackPanel.Resources>
@@ -39,9 +39,9 @@
                 <Label Content="Current BPM" Width="110" DockPanel.Dock="Top"/>
             </DockPanel>
             <DockPanel Height="26" LastChildFill="False" HorizontalAlignment="Stretch">
-                <TextBox Name="textBox_Resistance" Text="" TextWrapping="Wrap" Width="110" DockPanel.Dock="Right" IsReadOnly="true"/>
-                <TextBox Name="textBox_CurrentSpeed" Text="" TextWrapping="Wrap" Width="110" DockPanel.Dock="Left" IsReadOnly="true"/>
-                <TextBox Name="textBox_CurrentBPM" Text="" TextWrapping="Wrap" Width="110" DockPanel.Dock="Top" Height="26" IsReadOnly="true"/>
+                <TextBox Name="textBox_Resistance" Text="{Binding Path=Resistance}" TextWrapping="Wrap" Width="110" DockPanel.Dock="Right" IsReadOnly="true"/>
+                <TextBox Name="textBox_CurrentSpeed" Text="{Binding Path=Speed}" TextWrapping="Wrap" Width="110" DockPanel.Dock="Left" IsReadOnly="true"/>
+                <TextBox Name="textBox_CurrentBPM" Text="{Binding Path=BPM}" TextWrapping="Wrap" Width="110" DockPanel.Dock="Top" Height="26" IsReadOnly="true"/>
             </DockPanel>
             <DockPanel Height="26" LastChildFill="False">
                 <Label Content="Distance Covered" Width="110" DockPanel.Dock="Right"/>
@@ -49,20 +49,19 @@
                 <Label Content="Acc. Power" Width="110" DockPanel.Dock="Top"/>
             </DockPanel>
             <DockPanel Height="26" LastChildFill="False">
-                <TextBox Name="textBox_DistanceCovered" Text="" TextWrapping="Wrap" Width="110" DockPanel.Dock="Right" IsReadOnly="true"/>
-                <TextBox Name="textBox_CurrentPower" Text="" TextWrapping="Wrap" Width="110" DockPanel.Dock="Left" IsReadOnly="true"/>
-                <TextBox Name="textBox_AccPower" Text="" TextWrapping="Wrap" Width="110" DockPanel.Dock="Top" Height="26" IsReadOnly="true"/>
+                <TextBox Name="textBox_DistanceCovered" Text="{Binding Path=Distance}" TextWrapping="Wrap" Width="110" DockPanel.Dock="Right" IsReadOnly="true"/>
+                <TextBox Name="textBox_CurrentPower" Text="{Binding Path=Curr_Power}" TextWrapping="Wrap" Width="110" DockPanel.Dock="Left" IsReadOnly="true"/>
+                <TextBox Name="textBox_AccPower" Text="{Binding Path=Acc_Power}" TextWrapping="Wrap" Width="110" DockPanel.Dock="Top" Height="26" IsReadOnly="true"/>
             </DockPanel>
         </StackPanel>
-        <ListBox Name="ChatBox"  Grid.Column="1" Margin="59,41,0,0" Grid.RowSpan="3"/>
+        <ListBox Name="ChatBox"  ItemsSource="{Binding ChatLog}" Grid.Column="1" Margin="59,41,0,0" Grid.RowSpan="3"/>
         <TextBox Name="textBox_Chat" Grid.Column="1" HorizontalAlignment="Left" Margin="59,10,0,0" Grid.Row="3" Text="TextBox" TextWrapping="Wrap" VerticalAlignment="Top" Width="235"/>
-        <Button Content="Button" Grid.Column="1" HorizontalAlignment="Left" Margin="59,33,0,0" Grid.Row="3" VerticalAlignment="Top" />
-        <Button Content="Start Session" Grid.Column="1" HorizontalAlignment="Left" Margin="69,86,0,0" Grid.Row="3" VerticalAlignment="Top" Width="97"/>
-        <Button Content="Stop Session" Grid.Column="1" HorizontalAlignment="Left" Margin="187,86,0,0" Grid.Row="3" VerticalAlignment="Top" Width="97" />
+        <Button x:Name="Send" Content="Send" Grid.Column="1" HorizontalAlignment="Left" Margin="59,33,0,0" Grid.Row="3" VerticalAlignment="Top" Command="{Binding Chat}" CommandParameter="{Binding ElementName=textBox_Chat}"/>
+        <Button Content="Start Session" Grid.Column="1" HorizontalAlignment="Left" Margin="69,86,0,0" Grid.Row="3" VerticalAlignment="Top" Width="97" Command="{Binding StartSession}" CommandParameter=""/>
+        <Button Content="Stop Session" Grid.Column="1" HorizontalAlignment="Left" Margin="187,86,0,0" Grid.Row="3" VerticalAlignment="Top" Width="97" Command="{Binding StopSession}" CommandParameter=""/>
         <TextBox x:Name="textBox_SetResistance" Grid.Column="1" HorizontalAlignment="Left" Margin="69,128,0,0" Grid.Row="3" TextWrapping="Wrap" VerticalAlignment="Top" Width="97"/>
-        <Button Content="Set Resistance" Grid.Column="1" HorizontalAlignment="Left" Margin="187,128,0,0" Grid.Row="3" VerticalAlignment="Top" Width="97" Height="18"/>
+        <Button Content="Set Resistance" Grid.Column="1" HorizontalAlignment="Left" Margin="187,128,0,0" Grid.Row="3" VerticalAlignment="Top" Width="97" Height="18" Command="{Binding SetResistance}" CommandParameter="{Binding ElementName=textBox_SetResistance}"/>
         <Canvas Grid.Row="3" Background="White" Margin="0,33,0,0"/>
         <ComboBox Name="DropBox" HorizontalAlignment="Left" Margin="0,6,0,0" Grid.Row="3" VerticalAlignment="Top" Width="190"/>
-        <Button Content="Client Info" Grid.Column="1" HorizontalAlignment="Left" Margin="207,6,0,0" VerticalAlignment="Top" Height="26" Width="82"/>
     </Grid>
 </UserControl>
diff --git a/DoctorApp/Views/MainView.xaml b/DoctorApp/Views/MainView.xaml
index 62a976d..dc14aee 100644
--- a/DoctorApp/Views/MainView.xaml
+++ b/DoctorApp/Views/MainView.xaml
@@ -8,10 +8,10 @@
       d:DesignHeight="450" d:DesignWidth="800">
 
     <Grid>
-        <TabControl ItemsSource="{Binding Tabs}" SelectedItem="{Binding Selected}">
+        <TabControl TabStripPlacement="Left" ItemsSource="{Binding Tabs}" SelectedItem="{Binding Selected}">
             <TabControl.ItemTemplate>
                 <DataTemplate>
-                    <TextBlock Text="{Binding TabName}"/>
+                    <TextBlock Text="{Binding Username}"/>
                 </DataTemplate>
             </TabControl.ItemTemplate>
             <TabControl.ContentTemplate>
diff --git a/DoctorApp/Views/MainWindow.xaml b/DoctorApp/Views/MainWindow.xaml
index 024aa68..5d39be2 100644
--- a/DoctorApp/Views/MainWindow.xaml
+++ b/DoctorApp/Views/MainWindow.xaml
@@ -5,6 +5,9 @@
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
         xmlns:local="clr-namespace:DoctorApp"
         mc:Ignorable="d"
+        Background="Transparent"
+        WindowStyle="None"
+        AllowsTransparency="True"
         Title="MainWindow" Height="450" Width="800">
     <Window.Resources>
         <Style TargetType="{x:Type local:MainWindow}">
diff --git a/Hashing/DataParser.cs b/Hashing/DataParser.cs
index 9a6bc3e..20851f9 100644
--- a/Hashing/DataParser.cs
+++ b/Hashing/DataParser.cs
@@ -195,20 +195,29 @@ namespace Util
             return getMessage(payload, 0x01);
         }
 
-        public static byte[] getStartSessionJson()
-        {
-            return getJsonMessage(START_SESSION);
-        }
-
-        public static byte[] getStopSessionJson()
-        {
-            return getJsonMessage(STOP_SESSION);
-        }
-
-        public static byte[] getSetResistanceJson(float mResistance)
+        public static byte[] getStartSessionJson(string user)
         {
             dynamic data = new
             {
+                username = user
+            };
+            return getJsonMessage(START_SESSION, data);
+        }
+
+        public static byte[] getStopSessionJson(string user)
+        {
+            dynamic data = new
+            {
+                username = user
+            };
+            return getJsonMessage(STOP_SESSION, data);
+        }
+
+        public static byte[] getSetResistanceJson(string user,float mResistance)
+        {
+            dynamic data = new
+            {
+                username = user,
                 resistance = mResistance
             };
             return getJsonMessage(SET_RESISTANCE, data);
@@ -258,6 +267,26 @@ namespace Util
             return ((dynamic)JsonConvert.DeserializeObject(Encoding.ASCII.GetString(json))).data.username;
         }
 
+        public static string getChatMessageFromJson(byte[] json)
+        {
+            return ((dynamic)JsonConvert.DeserializeObject(Encoding.ASCII.GetString(json))).data.chat;           
+        }
+
+        public static string getUsernameFromJson(byte[] json)
+        {
+            return ((dynamic)JsonConvert.DeserializeObject(Encoding.ASCII.GetString(json))).data.username;
+        }
+
+        public static byte[] getChatJson(string user, string message)
+        {
+            dynamic data = new
+            {
+                username = user,
+                chat = message
+            };
+            return getJsonMessage(MESSAGE, data);
+        }
+
 
     }
 }
diff --git a/Server/Client.cs b/Server/Client.cs
index ed8e0c0..0d13187 100644
--- a/Server/Client.cs
+++ b/Server/Client.cs
@@ -3,9 +3,9 @@ using System.IO;
 using System.Net.Sockets;
 using System.Text;
 using Newtonsoft.Json;
-using ClientApp.Utils;
 using System.Diagnostics;
 using Util;
+using System.Linq;
 
 namespace Server
 {
@@ -92,6 +92,8 @@ namespace Server
 
             string identifier;
             bool isJson = DataParser.getJsonIdentifier(message, out identifier);
+
+            Debug.WriteLine("server " + Encoding.ASCII.GetString(payloadbytes));
             if (isJson)
             {
                 switch (identifier)
@@ -111,18 +113,18 @@ namespace Server
                         }
                         break;
                     case DataParser.START_SESSION:
-                        this.saveData = new SaveData(Directory.GetCurrentDirectory() + "/" + this.username + "/" + sessionStart.ToString("yyyy-MM-dd HH-mm-ss"));
+                        this.communication.StartSessionUser(DataParser.getUsernameFromJson(payloadbytes));
                         break;
                     case DataParser.STOP_SESSION:
-                        this.saveData = null;
+                        this.communication.StopSessionUser(DataParser.getUsernameFromJson(payloadbytes));
                         break;
                     case DataParser.SET_RESISTANCE:
                         bool worked = DataParser.getResistanceFromResponseJson(payloadbytes);
                         Console.WriteLine($"set resistance worked is " + worked);
                         //set resistance on doctor GUI
                         break;
-                    case DataParser.MESSAGE:
-                        //TODO send message to clients
+                    case DataParser.DISCONNECT:
+                        communication.Disconnect(this);
                         break;
                     default:
                         Console.WriteLine($"Received json with identifier {identifier}:\n{Encoding.ASCII.GetString(payloadbytes)}");
@@ -168,7 +170,7 @@ namespace Server
                     Console.WriteLine("Log in");
                     this.username = username;
                     sendMessage(DataParser.getLoginResponse("OK"));
-                    sendMessage(DataParser.getStartSessionJson());
+                    //sendMessage(DataParser.getStartSessionJson());
                     return true;
                 }
                 else
@@ -185,6 +187,7 @@ namespace Server
 
         public void sendMessage(byte[] message)
         {
+            Debug.WriteLine("serverclient " + Encoding.ASCII.GetString(message.Skip(5).ToArray()));
             stream.BeginWrite(message, 0, message.Length, new AsyncCallback(OnWrite), null);
         }
 
@@ -242,5 +245,15 @@ namespace Server
                 hex.AppendFormat("{0:x2}", b);
             return hex.ToString();
         }
+
+        public void StartSession()
+        {
+            this.saveData = new SaveData(Directory.GetCurrentDirectory() + "/" + this.username + "/" + sessionStart.ToString("yyyy-MM-dd HH-mm-ss"));
+        }
+
+        public void StopSession()
+        {
+            this.saveData = null;
+        }
     }
 }
diff --git a/Server/Communication.cs b/Server/Communication.cs
index d064de4..f677ddd 100644
--- a/Server/Communication.cs
+++ b/Server/Communication.cs
@@ -5,7 +5,6 @@ using System.IO.Pipes;
 using System.Linq;
 using System.Net.Sockets;
 using System.Text;
-using DoctorApp.Utils;
 using Util;
 
 namespace Server
@@ -26,8 +25,9 @@ namespace Server
                 this.mDoctor = value;
                 this.clients.ForEach((client) =>
                 {
-                    var dinges = DataParser.getNewConnectionJson(client.username);
-                    Debug.WriteLine("foreach " + Encoding.ASCII.GetString(dinges));
+                    Debug.WriteLine("foreach called for " + client.username);
+                    byte[] dinges = DataParser.getNewConnectionJson(client.username);
+                    Debug.WriteLine("foreach " + Encoding.ASCII.GetString(dinges.Skip(5).ToArray()));
                     this.mDoctor.sendMessage(dinges);
                 });
             }
@@ -59,11 +59,13 @@ namespace Server
         internal void Disconnect(Client client)
         {
             clients.Remove(client);
+            Doctor.sendMessage(DataParser.getDisconnectJson(client.username));
         }
 
         public void NewLogin(Client client)
         {
-            clients.Add(client);
+            this.clients.Add(client);
+            Debug.WriteLine("amount of clients is now " + this.clients.Count);
             var dinges = DataParser.getNewConnectionJson(client.username);
             Debug.WriteLine("new login" + Encoding.ASCII.GetString(dinges));
             Doctor?.sendMessage(dinges);
@@ -77,5 +79,30 @@ namespace Server
             }
             this.clients.Remove(client);
         }
+
+        public void StartSessionUser(string user)
+        {
+            foreach(Client client in clients)
+            {
+                if(client.username == user)
+                {
+                    client.sendMessage(DataParser.getStartSessionJson(user));
+                    client.StartSession();
+                }
+            }
+        }
+
+        public void StopSessionUser(string user)
+        {
+            foreach (Client client in clients)
+            {
+                if (client.username == user)
+                {
+                    client.sendMessage(DataParser.getStopSessionJson(user));
+                    client.StopSession();
+                }
+            }
+
+        }
     }
 }