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private static extern int RegNotifyChangeKeyValue(

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    LONG WINAPI RegNotifyChangeKeyValue(

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Declare Function RegNotifyChangeKeyValue Lib "advapi32.dll" (hKey As IntPtr, _

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    private static extern int RegNotifyChangeKeyValue(

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           // The "Close()" will trigger RegNotifyChangeKeyValue if it is still listening

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            // RegNotifyChangeKeyValue blocks until a change occurs.

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            int result = RegNotifyChangeKeyValue(ptr, true, this._filter, IntPtr.Zero, false);

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Documentation

[RegNotifyChangeKeyValue] on MSDN