# Using Passenger preferences

You can use Phusion Passenger to run Ruby on Rails and Rack applications on the Apache web server included with Mac OS X.

Preference | Explanation
--- | ---
Address | The address to use for viewing the application in a web browser, e.g. “myapp.local”.
Aliases | Alternative addresses for the application, e.g. “admin.myapp.local”.
Folder | The folder containing the application files.
Run in… | The environment you want to run the application in.

You can drag an item from the source list onto a text editor or into the terminal to further customize the Apache configuration.