The shortcuts to set an image opened in IrfanView as your desktop wallpaper are shown on a submenu of the Options menu:
Ctrl Shift C = Centre Image
Ctrl Shift T = Tile Image
Ctrl Shift S = Stretch Image
Ctrl Shift P = Previous Wallpaper.
Surface Pro (2017) vs Surface Pro 4
Where HTML5 is headed next
MacBook Pro v Surface Pro 5
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