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Hide the dock icon of a program when it is running

Go to the application's bundle (e.g. X11.app) and open the bundle contents. Navigate to Info.plist, open it with a text editor or plist editor. Add or change an item with the key "NSUIElement" and set its value to "1" (type = string). On relaunch of the application, its icon will not appear in the dock.

This is usefull for apps like X11 which are servers and should be running in the background.
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