You may know how to customise the lock screen on your Windows PC, but there’s a way to customise the screen on OX X Lion as well.
To do so, go to the Security and Privacy window, and then under the “General” tab, check the box that says “Show a message when the screen is locked”.
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Then, you can add whatever message you like. Keep it under 200 characters, as anything over that will be cut off.