Group Policy: Hide Locked User Display on Windows 7

While I did show how to set this in the registry using various script options (Daniel Petri demonstrated it first by using the registry editor), there is a MUCH easier way: Group Policy.

Computer Configuration
...Policies
   ...Windows Settings
      ...Security Settings
         ...Local Policies
            ...Security Options:

Interactive logon: Display user information when the session is locked
    Enable --> "Do not display user information"