introduced InstanceIdentifier and applied it to Tab Title.

MultiTerm.Core/ViewModel/SendReceiveViewModel.cs

@@ -11,14 +11,6 @@ namespace MultiTerm.Core.ViewModel;
 
 public partial class SendReceiveViewModel : TerminalViewModel
 {
-    public override string Title 
-    {
-        get
-        {
-            return $"{ViewType} {ProtocolType}";
-        }
-    }
-
     public override TerminalViewType ViewType => TerminalViewType.SendReceive;
 
     /// <summary>

MultiTerm.Core/ViewModel/TerminalViewModel.cs

@@ -20,9 +20,42 @@ public abstract partial class TerminalViewModel : ObservableObject, ITerminalVie
     private readonly IMessenger messenger;
     private readonly IContext context;
 
-    public abstract string Title { get; }
-    public abstract TerminalViewType ViewType { get; }  
-    public ProtocolType ProtocolType { get; set; }
+    public abstract TerminalViewType ViewType { get; }
+
+    private ProtocolType protocolType;
+
+    public ProtocolType ProtocolType
+    {
+        get { return this.protocolType; }
+        set
+        {
+            this.protocolType = value;
+            this.UpdateTitle();
+        }
+    }
+
+    #region Title
+    /// <summary>
+    /// Terminal title, to allow user to distinguish between different terminals.
+    /// </summary>
+    [ObservableProperty]
+    private string title = string.Empty;
+
+    /// <summary>
+    /// Update the Property <see cref="Title"/>. To be called when it was changed.
+    /// </summary>
+    private void UpdateTitle()
+    {
+        if(this.CommunicationProtocol == null)
+        {
+            this.Title = $"{ProtocolType}";
+        }
+        else
+        {
+            this.Title = $"{ProtocolType} {this.CommunicationProtocol?.InstanceIdentifier}";
+        }
+    } 
+    #endregion
 
     /// <summary>
     /// Holds communication data, meaning data that was sent to or received over the communication protocol.
@@ -48,7 +81,9 @@ public abstract partial class TerminalViewModel : ObservableObject, ITerminalVie
         get { return this.communicationProtocol; }
         set 
         { 
+            // store communication protocol
             this.communicationProtocol = value;
+
             // register communication protocol in the Communication Data View Model
             this.CommunicationData = new CommunicationDataViewModel(this.communicationProtocol, this.context);
 
@@ -126,6 +161,7 @@ public abstract partial class TerminalViewModel : ObservableObject, ITerminalVie
         if (CommunicationProtocol == null) { throw new Exception($"To call '{nameof(OnViewModelRequestedConnect)}()', CommunicationProtocol must not be null!"); }
 
         e.Success = this.CommunicationProtocol.Connect(e.Settings);
+        this.UpdateTitle();
     }
 
     private void OnViewModelRequestedDisconnect(object? sender, EventArgs e)

MultiTerm.Protocols/CommunicationProtocol.cs

@@ -17,6 +17,7 @@ public abstract class CommunicationProtocol : ICommunicationProtocol
     public event EventHandler<DisconnectedEventArgs>? DisconnectedEvent;
 
     public abstract ProtocolType ProtocolType { get; }
+    public abstract string InstanceIdentifier { get; protected set; }
 
     public bool IsConnected { get; private set; } = false;
 

MultiTerm.Protocols/ICommunicationProtocol.cs

@@ -12,6 +12,11 @@ public interface ICommunicationProtocol
     /// </summary>
     ProtocolType ProtocolType { get; }
 
+    /// <summary>
+    /// Short identifier string that allows the user to distinguish different instances.
+    /// </summary>
+    string InstanceIdentifier { get; }
+
     /// <summary>
     /// New data received from connected device.
     /// </summary>

MultiTerm.Protocols/Serial/SerialProtocol.cs

@@ -10,6 +10,9 @@ namespace MultiTerm.Protocols.Serial;
 public class SerialProtocol : CommunicationProtocol
 {
     public override ProtocolType ProtocolType => ProtocolType.Serial;
+
+    public override string InstanceIdentifier { get; protected set; } = string.Empty;
+
     private ISerialProtocolSettings? serialSettings;
     private SerialPortStream serialPort = new();
 
@@ -29,6 +32,9 @@ public class SerialProtocol : CommunicationProtocol
         // store locally
         this.serialSettings = serialProtocolSettings;
 
+        // update identifier 
+        this.InstanceIdentifier = this.serialSettings.PortName;
+
         // create new serial port
         this.serialPort = new()
         {
@@ -69,7 +75,7 @@ public class SerialProtocol : CommunicationProtocol
     {
         while(ct.IsCancellationRequested == false)
         {
-            // reads character based on configured encoding (here Unicode)
+            // reads character based on configured encoding (here ASCII)
             int readCharacter = serialPort.ReadChar();  
             if (readCharacter != -1) // -1 = timeout
             {