Everything was a secret The Dock was developed alongside Finder, another essential part of Mac OS X. However, the project started being written in Mac OS 9 before the new OS was even ready.

If you're comfortable pasting commands into Terminal, it's perfectly possible to increase or decrease the number of recently opened apps that show in your Dock. Open a Terminal window (the app can ...

The Mac can't do that, unless you install DockDoor. This free and open-source application adds previews to the dock and also gives you a proper Ctrl-Tab keyboard shortcut for switching windows.