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This can be changed in System Settings > Shortcuts and Gestures > Global Keyboard Shortcuts > KDE component = Plasma Desktop Shell > Show Dashboard. To show the widget dashboard, the default keyboard shortcut is Ctrl-F12.

Each can be triggered by a keyboard shortcut, by a mouse-click on a widget (plasmoid), or by pushing the mouse cursor into the corner of the screen. There are two similar ways of showing this dashboard/desktop: either as a transparent overlay over all of your windows ("dashboard"), or by hiding all the current windows on screen ("desktop"). Users can make this behave like a traditional desktop, by using "folder view". First, some background: KDE4 doesn't have a "desktop" per se, but uses a "widget dashboard".
