Remote Session - Darken Screen

Remote Session - Darken Screen

I'm curious if there is a way to change what the "Darken Screen" option actually shows when on a remote session. 

Often times a user will just think the computer is off or frozen so they'll attempt a hard shutdown of the computer. It'd be beneficial if we could change this to a splash image of our choosing. That way we can put a generic "Help Desk is currently remoted onto this computer" message to display on the screen with number for them to call if needed.
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