How to Add or Delete Icons in the Dock

All Dock icons are merely aliases (shortcuts) to the actual application or file.
The default Dock icons for OSX 10.4 (Tiger) are shown below.

Right-click (or Option-click) on a Dock icon to reveal a contextual menu of options.

To keep a new icon permanently in the Dock, right click, then select 'Keep in Dock' option.

Another way to add an icon is by dragging the original app icon found in the Applications folder onto the Dock to create an alias.

How to customize the Dock in OS10.5

How to customize the Dock in OS10.6 and later

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