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Ubuntu's unity does the command lookup thing with its HUD.

XFCE allows one to change keyboard shortcut settings in a similar fashion (from within the menus as it doesn't have the HUD)?

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That's one of the things I really like about Unity. Can't remember which menu the mouse settings are buried in? No problem, just type "mouse" into the dash.

To be fair, Windows 8+ does that too.

Unity's HUD does it automatically for any program you have open. Windows 7+'s desktop search includes programs and control panel applets, but not much else.

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