The middle mouse button offers extended functionality in the most software – e.g. it can be used in web browsers to open or close tabs. When using the integrated trackpad of a MacBook or the Apple Magic Mouse this will not work due to missing mouse buttons.
To enable this functionality under OS X there is a free software named MagicPrefs. Beside gestures it is also possible to configure additional tweaks or functions – for me the most important feature is the middle mouse click.
Once the software is installed, the configuration can be changed in the system settings under the MagicPrefs pane. I configured a three-finger gesture for the middle mouse click:
The settings can vary depending on the mouse art (Trackpad, Magic Trackpad, Magic Mouse) variieren. The software functionality can be extended by installing additional plugins.