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Try function key F11. Show desktop.

If you have a different mapping for Show Desktop, you can find it in System Preferences, Keyboard, Keyboard Shortcuts, Mission Control.
 
The screen is maximized and I need to drag an icon to the desktop. How do I do?
(In Windows 7 there is a tiny bar at the lower right to access)

You should set a hot corner in system preferences for showing the desktop. Then you would just start dragging the file or folder, move the mouse to that corner of the screen and then drop it onto the desktop. you could also drag to the Finder icon and then use spring-loaded folders, or the Desktop icon in the sidebar of your Finder window. I suppose that a keyboard shortcut would work just as well as a hot corner, it just seems easier to use the corner if you're already dragging something.
 
You should set a hot corner in system preferences for showing the desktop. Then you would just start dragging the file or folder, move the mouse to that corner of the screen and then drop it onto the desktop. you could also drag to the Finder icon and then use spring-loaded folders, or the Desktop icon in the sidebar of your Finder window. I suppose that a keyboard shortcut would work just as well as a hot corner, it just seems easier to use the corner if you're already dragging something.

Thank you buddies. It works like a charm!!
 
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