Q: How to create a Login window banner in OS X Mountain Lion

This was answered in a support post for OS X Lion. http://support.apple.com/kb/HT4788 however the /Library/Security folder does not exist in OS X Mountain Lion. The solution for Mountain Lion is very simple. Create the folder.

1. Open Finder

2. Click on "Go"

3. Select "Go to Folder"

3. Type in /Library/ and click Go

4. Click "File"

5. Select "New Folder"

6. You will need to Authenticate with your password

7. Name the new folder "Security"

8. Drop your "PolicyBanner" file in the new security folder