To display the calendar on your computer screen :
> download the calendar of your choice to your desktop,
> right-click on the image,
> choose the option that says, “Set as Desktop Background / Wallpaper”, (exact wording will depend on the browser you use).
If the image does not fit your desktop background neatly, you may have to go to your preference panel :
> Control Panel
> Desktop) and choose “Fit to screen” as the display mode of your background image, or choose another size if you prefer that the calendar does not fill the whole screen-
(Mac users will have to use different commands to the same effect).