diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/controllers/Controller.cpp b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/controllers/Controller.cpp
index e3a85b0..9bc1d86 100644
--- a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/controllers/Controller.cpp
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/controllers/Controller.cpp
@@ -6,6 +6,7 @@ Description: Implementation file containing the method definitions of the
 Author: Trenser
 Date:19-May-2026
 */
+
 #include "ComboPackage.h"
 #include "Controller.h"
 #include "Enums.h"
diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/datastores/sharedmemory/FileHeader.h b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/datastores/sharedmemory/FileHeader.h
index 5d0a875..929dbf4 100644
--- a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/datastores/sharedmemory/FileHeader.h
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/datastores/sharedmemory/FileHeader.h
@@ -1,3 +1,12 @@
+/*
+File: FileHeader.h
+Description: Defines the FileHeader structure used to store
+             metadata for binary record files, including
+             record count and capacity.
+Author: Trenser
+Created: 10-June-2026
+*/
+
 #pragma once
 #include <cstddef>
 
diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/datastores/sharedmemory/MappingInfo.h b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/datastores/sharedmemory/MappingInfo.h
index 7b0baed..ebd5123 100644
--- a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/datastores/sharedmemory/MappingInfo.h
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/datastores/sharedmemory/MappingInfo.h
@@ -1,3 +1,13 @@
+/*
+File: MappingInfo.h
+Description: Defines the MappingInfo structure used for
+             managing Windows file mapping operations.
+             Stores handles, mapped view pointer,
+             file metadata, and capacity information.
+Author: Trenser
+Created: 10-June-2026
+*/
+
 #pragma once
 #include <windows.h>
 #include <string>
diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/datastores/sharedmemory/RecordState.h b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/datastores/sharedmemory/RecordState.h
index 8e3aadc..95402fd 100644
--- a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/datastores/sharedmemory/RecordState.h
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/datastores/sharedmemory/RecordState.h
@@ -1,3 +1,12 @@
+/*
+File: RecordState.h
+Description: Defines the RecordState enumeration used to
+             represent the state of a record in storage.
+             States include CLEAN, NEW_RECORD, and MODIFIED.
+Author: Trenser
+Created: 10-June-2026
+*/
+
 #pragma once
 
 enum class RecordState : int
diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/datastores/sharedmemory/SerializedRecords.h b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/datastores/sharedmemory/SerializedRecords.h
index 62dfacf..2d18842 100644
--- a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/datastores/sharedmemory/SerializedRecords.h
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/datastores/sharedmemory/SerializedRecords.h
@@ -1,3 +1,15 @@
+/*
+File: SerializedRecords.h
+Description: Defines serialized structures for persistent storage
+             and retrieval of system entities including User,
+             Notification, Service, ComboPackage, InventoryItem,
+             ServiceBooking, JobCard, Invoice, and Observer.
+             These structures use fixed-size character arrays
+             and primitive types for binary serialization.
+Author: Trenser
+Created: 10-June-2026
+*/
+
 #pragma once
 #include "Utility.h"
 #include "Enums.h"
diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/datastores/sharedmemory/SharedMemory.cpp b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/datastores/sharedmemory/SharedMemory.cpp
index aa0c494..6a10c9f 100644
--- a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/datastores/sharedmemory/SharedMemory.cpp
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/datastores/sharedmemory/SharedMemory.cpp
@@ -1,3 +1,14 @@
+/*
+File: SharedMemory.cpp
+Description: Implements shared memory utilities for managing
+             Windows file mapping operations. Provides functions
+             to create, open, resize, and close mappings, as well
+             as access headers, records, and ensure synchronization
+             across processes.
+Author: Trenser
+Created: 11-June-2026
+*/
+
 #include "SharedMemory.h"
 #include "Config.h"
 
diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/datastores/sharedmemory/SharedMemory.h b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/datastores/sharedmemory/SharedMemory.h
index f647d10..a288ab3 100644
--- a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/datastores/sharedmemory/SharedMemory.h
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/datastores/sharedmemory/SharedMemory.h
@@ -1,3 +1,14 @@
+/*
+File: SharedMemory.h
+Description: Declares functions for managing Windows file
+             mapping and shared memory operations. Provides
+             utilities for creating, resizing, and closing
+             mappings, as well as accessing headers and
+             record data.
+Author: Trenser
+Created: 10-June-2026
+*/
+
 #pragma once
 #include <cstddef>
 #include "MappingInfo.h"
diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/datastores/sharedmemory/TrackedRecord.h b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/datastores/sharedmemory/TrackedRecord.h
index 156b815..5ff9ac9 100644
--- a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/datastores/sharedmemory/TrackedRecord.h
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/datastores/sharedmemory/TrackedRecord.h
@@ -1,3 +1,13 @@
+/*
+File: TrackedRecord.h
+Description: Defines the TrackedRecord template structure used
+             to manage objects with associated record state and
+             slot index. Supports tracking of CLEAN, NEW_RECORD,
+             and MODIFIED states for persistence and synchronization.
+Author: Trenser
+Created: 10-June-2026
+*/
+
 #pragma once
 #include "RecordState.h"
 
diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/models/Invoice.cpp b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/models/Invoice.cpp
index d846f08..ddc3973 100644
--- a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/models/Invoice.cpp
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/models/Invoice.cpp
@@ -520,4 +520,4 @@ Invoice* Invoice::deserialize(const SerializedInvoice& serializedInvoice)
         serializedInvoice.paymentDate,
         serializedInvoice.paymentMethod,
         serializedInvoice.status);
-}
+}
\ No newline at end of file
diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/models/Service.h b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/models/Service.h
index 320e4ad..bff13d6 100644
--- a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/models/Service.h
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/models/Service.h
@@ -6,7 +6,6 @@ Author: Trenser
 Date: 19-May-2026
 */
 
-
 #pragma once
 #include <string>
 #include "Map.h"
diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/models/ServiceBooking.cpp b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/models/ServiceBooking.cpp
index 708b360..ab5d6a6 100644
--- a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/models/ServiceBooking.cpp
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/models/ServiceBooking.cpp
@@ -6,6 +6,7 @@ Description: Implementation file containing the method definitions of the
 Author: Trenser
 Date:19-May-2026
 */
+
 #include <stdexcept>
 #include <sstream>
 #include "SerializedRecords.h"
diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/models/ServiceBooking.h b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/models/ServiceBooking.h
index 1489f9b..433d9d1 100644
--- a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/models/ServiceBooking.h
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/models/ServiceBooking.h
@@ -6,6 +6,7 @@ Description: Header file declaring the ServiceBooking class, which represents
 Author: Trenser
 Date:19-May-2026
 */
+
 #pragma once
 #include <string>
 #include "Map.h"
diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/services/UserManagementService.h b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/services/UserManagementService.h
index 6b9f518..b448872 100644
--- a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/services/UserManagementService.h
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/services/UserManagementService.h
@@ -6,6 +6,7 @@ Description: Header file declaring the UserManagementService class, which manage
 Author: Trenser
 Date:19-May-2026
 */
+
 #pragma once
 #include <string>
 #include "Map.h"
diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/utilities/FileHelper.h b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/utilities/FileHelper.h
index 2b3e94a..c8bf96f 100644
--- a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/utilities/FileHelper.h
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/utilities/FileHelper.h
@@ -106,4 +106,4 @@ namespace util
             file << records[index] << '\n';
         }
     }
-}
+}
\ No newline at end of file
diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/utilities/InputHelper.h b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/utilities/InputHelper.h
index 75d8bbc..dffc199 100644
--- a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/utilities/InputHelper.h
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/utilities/InputHelper.h
@@ -10,6 +10,7 @@
 #include <limits>
 #include <string>
 #include <stdexcept>
+#include <conio.h>
 
 namespace util
 {
@@ -54,6 +55,48 @@ namespace util
         value = cleanedValue;
     }
 
+    /*
+     * Function: readPassword
+     * Description: Reads a password from console without echoing characters;
+     *              displays '*' for each character typed, handles backspace,
+     *              and cleans commas from the result.
+     * Parameters:
+     *     value - reference to a string where the password will be stored
+     * Returns:
+     *     void - no return value
+     */
+    inline void readPassword(std::string& value)
+    {
+        value.clear();
+        char currentCharacter;
+        while ((currentCharacter = _getch()) != '\r')
+        {
+            if (currentCharacter == '\b')
+            {
+                if (!value.empty())
+                {
+                    value.pop_back();
+                    std::cout << "\b \b";
+                }
+            }
+            else
+            {
+                value += currentCharacter;
+                std::cout << '*';
+            }
+        }
+        std::cout << std::endl;
+        std::string cleanedValue;
+        for (int iterator = 0; iterator < value.length(); iterator++)
+        {
+            if (value[iterator] != ',')
+            {
+                cleanedValue += value[iterator];
+            }
+        }
+        value = cleanedValue;
+    }
+
     /*
      * Function: pressEnter
      * Description: Pauses execution until the user presses Enter.
diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/views/CustomerMenu.cpp b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/views/CustomerMenu.cpp
index 3e56d99..0d60f97 100644
--- a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/views/CustomerMenu.cpp
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/views/CustomerMenu.cpp
@@ -30,7 +30,6 @@ Description: Displays the customer menu and handles user input until logout is s
 Parameter: None
 Return type: void
 */
-
 void CustomerMenu::showMenu()
 {
     while (true)
diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/views/MenuHelper.h b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/views/MenuHelper.h
index 83720c0..c6ebaa6 100644
--- a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/views/MenuHelper.h
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/views/MenuHelper.h
@@ -914,7 +914,7 @@ inline void changePasswordHelper(Controller& controller)
         util::clear();
         std::cout << "Change Password\n";
         std::cout << "Enter new password: ";
-        util::read(newPassword);
+        util::readPassword(newPassword);
         if (!util::isPasswordValid(newPassword))
         {
             std::cout << "Error: Password is not strong enough!\n";
@@ -928,7 +928,7 @@ inline void changePasswordHelper(Controller& controller)
             continue;
         }
         std::cout << "Confirm new password: ";
-        util::read(confirmedPassword);
+        util::readPassword(confirmedPassword);
         if (confirmedPassword != newPassword)
         {
             std::cout << "Passwords are different. Try again\n";
diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/views/TechnicianMenu.h b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/views/TechnicianMenu.h
index a17ccb1..2d118a0 100644
--- a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/views/TechnicianMenu.h
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/views/TechnicianMenu.h
@@ -22,4 +22,4 @@ public:
     void viewNotifications();
     void logout();
     void changePassword();
-};
+};
\ No newline at end of file
diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/views/UserInterface.cpp b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/views/UserInterface.cpp
index 841e2ea..4596d9b 100644
--- a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/views/UserInterface.cpp
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/views/UserInterface.cpp
@@ -106,7 +106,7 @@ void UserInterface::login()
 	std::cout << "Enter username: ";
 	util::read(username);
 	std::cout << "Enter password: ";
-	util::read(password);
+	util::readPassword(password);
 	if (m_controller.login(username, password))
 	{
 		const User* authenticatedUser = m_controller.getAuthenticatedUser();
@@ -167,7 +167,7 @@ void UserInterface::registerCustomer()
 		return;
 	}
 	std::cout << "Enter password: ";
-	util::read(password);
+	util::readPassword(password);
 	if (!util::isPasswordValid(password))
 	{
 		std::cout << "Error: Password is invalid!";
@@ -185,4 +185,4 @@ void UserInterface::registerCustomer()
 	m_controller.createCustomer(username, name, password, email, phone);
 	std::cout << "Registration is successful";
 	util::pressEnter();
-}
+}
\ No newline at end of file