When we’re deploying Mac OS X there are a number of things that invariably end up being discussed. One of these is customizing the login window, where you type in your username and password. This might be swapping out the background of the screen, adding text or even changing out the Apple logo. To change out the background of the loginwindow, you can specify a new location. By default the location is stored in /System/Library/CoreServices as DefaultDesktop.jpg. You could replace this image or the preferred method would more than likely be to choose your image and then alter the /Library/Preferences/com.apple.loginwindow.plist, editing the key for DesktopPicture. For example, we can use…