Using library shortcuts
iPhoto Library Manager provides a feature called library shortcuts which let you easily open any iPhoto library by just double clicking a file. To create a library shortcut, either use the "Create Shortcut" command in the File menu. A file will be created there that will, when double clicked, open up iPhoto Library Manager, switch to the library you created the shortcut for, and open up that library in iPhoto. You can use a shortcut if you open up a particular library frequently, and don't want to bother with opening up iPhoto Library Manager and switching to that library manually every time you want to use it. You can even drag a shortcut file onto your dock, which will give you one click access to an iPhoto library.