Plug-in developers may can capture keystrokes to implement hot keys within their plug-in. Use the CWnd::SetFocus() if using MFC, or use SetFocus() if you are using Windows SDK.

Do the following in your Windows plug-in (Windows SDK way)
1.Call SetFocus((HWND)window->window) in your NPP_SetWindow().
2.Handle WM_KEYDOWN in your plug-in procedure.

(An extract from MFC documentation)
SetFocus() function sets the keyboard focus to the specified window.
The window, if any, that previously had the keyboard focus loses it.

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