The “Open Domain Quickly” Window
The “Open Domain Quickly” window shows a list of the different preference files found for the user you are currently running as, and the preference files in /Library/Preferences (listed under “System Preferences” at the top). Some of these you will notice set to the disabled text color (gray, by default). These preference files can be viewed, but not edited — these are files that can not be written to by the user you are currently running as. You can open these files by double clicking on them, or using the keyboard shortcut Shift-Command-O ( ⇧⌘O ), or you can Control ( ⌃ ) -click and use the contextual menu to open them up.
Tips
You can easily launch or quit an application by selecting its preference, and using the toolbar to launch or quit it, or by using the contextual menu.
You can delete domains using the window, by selecting the file(s) you wish to delete and pressing Delete ( ⌫ ), using the toolbar to delete them, or using the contextual menu to delete them. You can also undo a delete, so if you delete a domain by accident, you can just hit Command-Z ( ⌘Z ) to bring it back.
You can double click on a folder to expand so that you can see it’s items. Or click on the triangle next to the name. You can also use Shift-Command-O ( ⇧⌘O ) or use the “Open Quickly” command in the contextual menu to expand the folder. Whichever you feel most comfortable with.