WALL32 is a self-contained, real-time wallpaper generator, which simulates the Earth's & Moon's illumination by the Sun. It consists of a single EXE-file and runs in background. It reads the clock and timezone information of your PC and calculates the real-time illumination (every 5 minutes for the earth & every 30 minutes for the moon wallpaper). If time/date or timezone is changed, the program immediately updates the wallpaper.