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Editorial Team
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Asked: 2026-05-14T02:54:43+00:00

My hardware has a problem, from time to time it’s sending a keydown followed

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My hardware has a problem, from time to time it’s sending a “keydown” followed by a “keyup” event:

keydown: None LButton, OemClear 255

keyup: None LButton, OemClear 255

keydown: None LButton, OemClear 255

keyup: None LButton, OemClear 255

It goes like this, every 1 or 2 seconds, forever, in Windows.

In general it doesn’t affect most of the applications, because this key is not printable. I think it’s a special function key, like a media key or something. It doesn’t do anything.

But, in some applications that LISTEN to keydown and keyup, I get unexpected behaviour.

Question: is there a way to intercept these 2 keyboard events in Windows (for all applications & for Windows itself) and make the OS ignore them?

This is really important to me, if you can think of any solution, I’d be forever thankful.

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1 Answer

  1. Editorial Team

    You can write a small application that uses RegisterHotKey to register that keystroke as a System wide hotkey. Then Windows will turn that keystroke into a WM_HOTKEY message to your application window.

    This will cause your app to run a bit of code once a second or so, which is not really ideal, but it’s perhaps better than the alternative.

    The window handle needs to belong to your application, but it doesn’t have to be visible or very large. The hotkey is global, so it’s a bit like installing a hook between the keyboard and other applications.

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