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I currently have a Basic X Server with matchbox window manager with opens a nw.js (was called node-webkit) chromium browser.
matchbox has by default all hotkeys deactivated.
The only thing left ist the internal alt+f4 handling from chromium.

Is there some way to prevent the nw.js application from closing?

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  • The answer to your question is "don't press ALT+F4", but I assume the real question here is how to prevent the user from closing your app no matter what keys they press. – Dmitry Grigoryev Jul 4 '19 at 11:44
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Remap F4 to something else using

 xmodmap -e "keycode 70 = F3"

After that, for all progams running under X11 your keyboard will appear to have two F3 keys and no F4 key.

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