... or previous image. Move the mouse over the buttons to see a short description or over the thumbnails to see more information.
By default, the viewer starts in full screen mode but it can be switched to windowed mode by pressing F11. Also, you can press Enter to hide or show the toolbars, Space to start the slideshow or Escape to exit the program. To use this program as the default viewer for any image file, right click on the file and use the "Open with" option in the context menu.