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If you look at this Apple support page there's a big list of shortcuts that are not listed in System Preferences → Keyboard → Keyboard Shortcuts.

Specifically, Option-Command-H is interfering with a very useful shortcut of a program I use.

How can I change/remove this shortcut from the OS?

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As these shortcuts interfere, it's likely that the user is using a cross-platform non-Cocoa application whose menu item keyboard shortcuts cannot be changed. I mean, who'd develop an OS X application and not be aware of a global shortcut such as this one? – Daniel Beck Jul 10 '11 at 17:39
up vote 2 down vote accepted

I don't know of any way to remove the shortcut, but you can change it.

  1. Open the Keyboard & Mouse Preference Pane.
  2. Click on the Keyboard Shortcuts tab.
  3. Click the Add button (looks like a Plus sign).
  4. Be sure that the Application drop down is set to All Applications.
  5. In the Menu Title box, enter Hide Others.
  6. Click in the Keyboard Shortcut box and press the keyboard shortcut you'd like to change it to.
  7. Click Add to save changes.

Instructions adapted from a Macrumors guide.

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