[x] Use personal folder 

If you enable this checkbox, Wallpaper Changer stores the temporary bitmap in your "personal folder", usually "My Documents" (in English versions of Windows). This is the way you prevent 2 or more different users from putting there wallpaper on the others persons screen.
  

[x] Use global hot keys

The hot keys: [CTRL]+[SHIFT]+[ALT]+[F5] (restore/minimize) and [CTRL]+[SHIFT]+[ALT]+[F6] (change picture) are available in all applications.
  

[x] Button in Titlebar should

Choose what Wallpaper Changer should do when you click the close (x) button on the left of the Title bar:

• Minimize Wallpaper Changer to the icon in the System Tray.

• Show a list of common Wallpaper Changer commands and options, (default) or

• Exit Wallpaper Changer

[x] Thread Priority

I suggest, use always the lowest option to prevent conflicts when using Wallpaper Changer. If you have a slow computer you would like to have a low priority so that Wallpaper Changer doesn't take over your system while it converts the current image to a wallpaper. If you suffer a halt in you system (which can occur when Wallpaper Changer is resizing a jpeg, for example), simply lower the priority.