We usually use the Keyboard Shortcut "Win+D" or press the "Show Desktop" button in the Quick Launch Bar to access desktop, but unfortunately it isn't very convenient: If you like to keep 20+ programs running at the same time (just like me), the progress will take a few seconds. What's worse, you can't come back to the previous window instantly after running a program or opening a document from the desktop, you have to look for it in the taskbar and your train of thought is often interrupted.
Desk Topmost solves this in a different way: It will let the desktop float on the top instead of minimizing all the windows.
