To change login wallpaper, System Preferences > Desktop & Screen Saver > choose and customize image. When you change your profile photo, the change occurs on all devices using the same Apple ID/Apple ...
You can change nearly any desktop icon on both Mac and PC. To change desktop icons on a Mac, open the "Get Info" menu and paste in the picture you want to use. On a PC you'll need to make a .ICO file, ...
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