Windows: Right click on the image, then select "Set as Wallpaper" You can fine-tune your wallpaper settings in the Display Control Panel.
MacIntosh System 8 and 9: Click and hold the mouse button on the image. Pull down menu to "Download Image to Disk." Save the image down the path of: Your Hard Drive, System folder, Appearance, Desktop Pictures, and Photos. Go to "Appearance" under the control panels and set the image as your background.
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