NATO Wallpapers NATO horse "Alliantis" participates in Belgian Horse Parade resolution = 1024 x 768 - size = 167Kb Windows users: Right click on the photograph and choose 'Set as background'. MAC users: 1. Ctrl-Click on the photograph > Download image to Disk 2. Go to the Apple Menu > Control Panels > Appearance 3. Select Desktop Tab > Place Picture > Choose your photograph and finish with Set Desktop