Scheduled Wallpaper change

Scheduled Wallpaper change

I have manage engine service desk and desktop central.  I know how to create a policy to change a selected groups wallpaper to a specific jpg.  I need to do this on a schedule. (every 4 hours).
We're using a jpg as a dashboard and need to put it on a groups desktop as the wallpaper.

How can I do this from either of the platforms mentioned above?  Is it possible?  Is it possible through scripting?

Any help from anyone would be greatly appreciated.

Regards,

Tim
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