Code Breakdown

1. Global Variables and Definitions:

• keyA_code and keyD_code are initialized to 'A' and 'D' respectively, but can be changed based on the configuration file.
• keyStates keeps track of whether specific keys are pressed.
• hHook is used for the keyboard hook.
• nid is used for the system tray icon data.

2. Main Function:

• Loads the key bindings from a configuration file.
• Creates a named mutex to ensure only one instance runs.
• Registers a window class and creates a window.
• Initializes and adds a system tray icon.
• Sets a low-level keyboard hook to intercept key presses.
• Runs a message loop to handle Windows messages.

3. Keyboard Hook Procedure (KeyboardProc):

• Handles key down and key up events, managing the active and previous key states.

4. System Tray Icon Handling (InitNotifyIconData and WndProc):

• Initializes the system tray icon.
• Provides a context menu for exiting the application.

5. Configuration Management:

• Loads configuration settings from a file or restores from a backup if the file is missing.
• The CreateDefaultConfig and RestoreConfigFromBackup functions handle missing or corrupt configuration files.