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Sample Download : http://code.msdn.microsoft.com/CppWindowsHook-06957865

A hook is a point in the system message-handling mechanism where an application can install a subroutine to monitor the message traffic in the system and process certain types of messages before they reach the target window procedure.There are two types of Hooks - Thread specific hooks and global hooks. A thread specific hook is associated with particular thread only. While a global hook is associated with all threads in the same desktop as the calling thread. You must place a global hook procedure in a DLL(CppHookDll) separate from the application installing the hook procedure.

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