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7/9/2026
Building a Windows Lock App with OS-Level Keyboard Hooks and Process Protection

Building a Windows Lock App with OS-Level Keyboard Hooks and Process Protection

Original: The technical reason every Windows lock app fails — and how I fixed it at 13.

Short summary

A 13-year-old developer from India explains how they built a Windows lock app that operates at the OS level using low-level keyboard hooks, a process watchdog, and filesystem-level file protection. The app blocks Alt+Tab, Win key, Alt+F4, and kills Task Manager within 500ms. The project has 123+ downloads and is available as a free single .exe on GitHub.

  • •Uses Windows low-level keyboard hooks (SetWindowsHookExW) to block system shortcuts at OS level
  • •Watchdog thread kills Task Manager and process explorers every 500ms
  • •Files protected via icacls filesystem-level deny permissions; project built solo by a 13-year-old in India

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