Desktop Wallpaper Changer is a wallpaper downloader and switcher. The first time you launch the program, you will get a config dialog. First step-you need to select picture types,there are 12 types of them. The default is "internet picture", the program will automatically download pictures from the Internet, if there are some pictures you dislike, you can click "manage pictures" to delete it. You can easily switch to another picture source "Local picture", and then you can download pictures by yourself, and put those pictures in proper folder according the column of picture.