For MacBook owners, having the ability to add custom text to your Mac’s Login Window is invaluable if your MacBook is lost, stolen or just for identification purposes. I wrote an article on OS X 411 on how to Add Text to the OS X Login Window. 

As the above image suggests, it shows up on the user login window, you can change the login text anytime simply by editing a single file. I recommend this modification to any MacBook owner, I put a warning about FileVault and my phone number incase my MacBook Air is ever stolen or lost. Adding this to a desktop (iMac or Mac Pro) might be a little extreme, but nonetheless cool.

Read the original article.