Screen failure, keyboard strokes to make external monitor primary?

We just had the laptop screen on our MacBook Pro go out.  The external monitor still works but it shows the extended desktop, not the primary desktop.  Does anyone know the keystroke set that so that the video card treats the external monitor as the primary?  I am trying to back-up the data before I take the laptop into the Apple store.
Thanks

open the display preference pane, drag the menu bar that is being shown on the preference pane to the display you want it on (within the preference pane).

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