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    <p>I took a look at the only constructor of the <code>globalKeyboardHook</code> and looks like it is designed only for global hook. You can add another overload to hook into the current running module only like this:</p> <pre><code>class globalKeyboardHook { [DllImport("kernel32")] private static extern int GetCurrentThreadId(); [DllImport("user32")] private static extern IntPtr SetWindowsHookEx(int hookType, KeyBoardProc proc, IntPtr moduleHandle, int threadId); [DllImport("user32")] private static extern int CallNextHookEx(IntPtr hHook, int nCode, IntPtr wParam, IntPtr lParam); public globalKeyboardHook(bool currentModuleOnly){ if(currentModuleOnly){ proc = KeyBoardCallback; //WH_KEYBOARD = 0x2 hhook = SetWindowsHookEx(2, proc, IntPtr.Zero, GetCurrentThreadId()); } else hook(); } public delegate int KeyBoardProc(int nCode, IntPtr wParam, IntPtr lParam); public int KeyBoardCallback(int nCode, IntPtr wParam, IntPtr lParam) { if (nCode &gt;= 0) { Keys key = (Keys)wParam; var lp = lParam.ToInt64(); //your own handling with the key if ((lp &gt;&gt; 31) == 0)//Key down { //your own code ... } else { //Key up //your own code ... } } return CallNextHookEx(hHook, nCode, wParam, lParam); } KeyBoardProc proc; //other code ... } //then use the new overload constructor instead of the parameterless constructor: globalHook = new globalKeyboardHook(true); </code></pre> <p><strong>NOTE</strong>: You can implement your own <code>KeyDown</code> and <code>KeyUp</code> event based on what I posted above (the comment <code>your own code ...</code>). After some searching I understand that the <code>WH_KEYBOARD_LL</code> supports <strong>global hook</strong> only while the <code>WH_KEYBOARD</code> is for <code>thread hook</code> only. That should be what you want instead of the <code>WH_KEYBOARD_LL</code>.</p> <p>BTW, I doubt that the <code>IMessageFilter</code> which can be registered/added by your application can be used in this case. It also supports a <code>PreFilterMessage</code> method helping you to intercept any key and mouse messages at the <code>application-level</code>. You should try searching on that, it's easy to follow.</p>
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    1. POCapture Key press globally but suppress only for current app and child windows regardless of focus
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    1. COThanks. I added that code and its correctly getting the process's module handle but the global shift and control keys are still being captured globally when that app doesn't have focus. I tested it by switching to a Google Doc (and typing) and hitting shift while the winforms app was minimized.
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    2. CO@CGross see my update, it should be `thread-specific` now but even with that, I'm not sure if it solves your problem (because I'm even not really sure what your problem actually is).
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