Hook API SDK for easy and quickly develop Windows API Hooking Applications - Windows Shareware $280. Hook API SDK is a Software Development Kit for easy and quickly develop Windows system wide API Hooking Applications. It helps you hooking Windows system functions or functions in 3rd applications, this means you can call your own functions instead of some Windows system APIs or functions of other appliction, intercepts Windows system or 3rd application's functions and re-writing target function to easily customize and extend System or other existing application, whether an executable, or a library.