lxpanel lack hotkey function like fluxbox's .fluxbox/keys.
I don't want to use lxlauncher as my background. And even use lxlauncher, I still can't set hotkey as free as fluxbox.
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That's the job of window manager.
Please read the documentation on openbox wiki since it's fully documented.
If you don't like openbox, feel free to replace it with fluxbox in lxde.